22.1 Introduction to Files
Introduction to Files is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
file_name = "notes.txt"
print("File name:", file_name)
Output
File name: notes.txt
Output explanation: The output confirms that the introduction to files example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.2 Opening Files
Opening Files is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
file = open("notes.txt", "r")
print("File opened")
file.close()
Output
File opened
Output explanation: The output confirms that the opening files example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.3 File Modes
File Modes is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
print("r = read")
print("w = write")
print("a = append")
Output
r = read
w = write
a = append
Output explanation: The output confirms that the file modes example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.4 Reading Entire Files
Reading Entire Files is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
with open("notes.txt", "r") as file:
content = file.read()
print(content)
Output
Hello file!
Output explanation: The output confirms that the reading entire files example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.5 Reading Lines
Reading Lines is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
with open("notes.txt", "r") as file:
print(file.readline().strip())
Output
First line
Output explanation: The output confirms that the reading lines example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.6 Reading All Lines
Reading All Lines is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
with open("notes.txt", "r") as file:
lines = file.readlines()
print(lines)
Output
['First line\n', 'Second line']
Output explanation: The output confirms that the reading all lines example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.7 Writing Files
Writing Files is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
with open("notes.txt", "w") as file:
file.write("Hello file!")
print("Saved")
Output
Saved
Output explanation: The output confirms that the writing files example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.8 Appending Files
Appending Files is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
with open("notes.txt", "a") as file:
file.write("\nNew line")
print("Added")
Output
Added
Output explanation: The output confirms that the appending files example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.9 Creating Files
Creating Files is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
with open("new.txt", "x") as file:
file.write("Created")
print("New file created")
Output
New file created
Output explanation: The output confirms that the creating files example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.10 Closing Files
Closing Files is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
file = open("notes.txt", "r")
file.close()
print(file.closed)
Output
True
Output explanation: The output confirms that the closing files example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.11 The `with` Statement
The `with` Statement is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
with open("notes.txt", "w") as file:
file.write("Safe writing")
print("Automatically closed")
Output
Automatically closed
Output explanation: The output confirms that the the `with` statement example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.12 Context Managers
Context Managers is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
class Message:
def __enter__(self): return "Ready"
def __exit__(self, *args): print("Closed")
with Message() as text: print(text)
Output
Ready
Closed
Output explanation: The output confirms that the context managers example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.13 File Positions
File Positions is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
with open("notes.txt", "r") as file:
print(file.tell())
Output
0
Output explanation: The output confirms that the file positions example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.14 `seek()`
`seek()` is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
with open("notes.txt", "r") as file:
file.seek(2)
print(file.read())
Output
llo file!
Output explanation: The output confirms that the `seek()` example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.15 `tell()`
`tell()` is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
with open("notes.txt", "r") as file:
file.read(3)
print(file.tell())
Output
3
Output explanation: The output confirms that the `tell()` example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.16 Text Files
Text Files is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
text = "Python file"
print(type(text).__name__)
Output
str
Output explanation: The output confirms that the text files example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.17 Binary Files
Binary Files is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
data = b"ABC"
print(data)
Output
b'ABC'
Output explanation: The output confirms that the binary files example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.18 Encoding
Encoding is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
text = "Hello"
data = text.encode("utf-8")
print(data)
Output
b'Hello'
Output explanation: The output confirms that the encoding example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.19 Decoding
Decoding is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
data = b"Hello"
print(data.decode("utf-8"))
Output
Hello
Output explanation: The output confirms that the decoding example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.20 Handling File Errors
Handling File Errors is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
try:
open("missing.txt", "r")
except FileNotFoundError:
print("File not found")
Output
File not found
Output explanation: The output confirms that the handling file errors example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.21 Renaming Files
Renaming Files is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
from pathlib import Path
Path("old.txt").rename("new.txt")
print("Renamed")
Output
Renamed
Output explanation: The output confirms that the renaming files example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.22 Moving Files
Moving Files is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
import shutil
shutil.move("file.txt", "backup/file.txt")
print("Moved")
Output
Moved
Output explanation: The output confirms that the moving files example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.23 Copying Files
Copying Files is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
import shutil
shutil.copy("file.txt", "copy.txt")
print("Copied")
Output
Copied
Output explanation: The output confirms that the copying files example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.24 Deleting Files
Deleting Files is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
from pathlib import Path
Path("old.txt").unlink()
print("Deleted")
Output
Deleted
Output explanation: The output confirms that the deleting files example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.25 Working with Directories
Working with Directories is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
from pathlib import Path
Path("reports").mkdir(exist_ok=True)
print("Directory ready")
Output
Directory ready
Output explanation: The output confirms that the working with directories example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.26 `os` Module File Operations
`os` Module File Operations is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
import os
print(os.getcwd())
Output
/current/project/folder
Output explanation: The output confirms that the `os` module file operations example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.27 `pathlib`
`pathlib` is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
from pathlib import Path
path = Path("notes.txt")
print(path.name)
Output
notes.txt
Output explanation: The output confirms that the `pathlib` example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.28 Temporary Files
Temporary Files is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
import tempfile
with tempfile.TemporaryFile() as file:
file.write(b"test")
print("Temporary file used")
Output
Temporary file used
Output explanation: The output confirms that the temporary files example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.29 Practical File Projects
Practical File Projects is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
from pathlib import Path
for file in Path(".").glob("*.txt"):
print(file.name)
Output
notes.txt
report.txt
Output explanation: The output confirms that the practical file projects example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.30 Chapter Practice Exercises
Chapter Practice Exercises is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
numbers = [1, 2, 3]
with open("numbers.txt", "w") as file:
for number in numbers:
file.write(str(number) + "\n")
print("Exercise complete")
Output
Exercise complete
Output explanation: The output confirms that the chapter practice exercises example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
22.31 Chapter Mini Project
Chapter Mini Project is an important part of Python file handling. Beginners use this feature to work with information stored outside the program, keep data available after the program ends, and organize practical projects. The example below shows a simple and readable use. Always choose safe file names, correct modes, and proper error handling when working with real files.
Example
with open("journal.txt", "a") as file:
file.write("Today I learned file handling.\n")
print("Journal entry saved")
Output
Journal entry saved
Output explanation: The output confirms that the chapter mini project example completed its intended operation. File-system results can vary slightly by computer, folder, operating system, and the contents of existing files.
