Interview question

What are the different file open modes in Python? Python में file open modes क्या-क्या हैं?

Answer

Mode	Meaning
'r'	Read (default) - error if file doesn't exist
'w'	Write - creates file, TRUNCATES (erases) existing content
'a'	Append - creates file if missing, writes at the end
'x'	Exclusive creation - errors if file already exists
'b'	Binary mode suffix (e.g. 'rb', 'wb')
'+'	Read and write suffix (e.g. 'r+', 'w+')

with open('data.txt', 'r') as f:
    content = f.read()

with open('data.txt', 'w') as f:
    f.write('New content')  # WARNING: erases everything that was there before

with open('data.txt', 'a') as f:
    f.write('\nAppended line')  # adds to the end, keeps existing content

with open('image.png', 'rb') as f:
    binary_data = f.read()  # bytes, not str

with open('new_file.txt', 'x') as f:
    f.write('Created fresh')  # FileExistsError if new_file.txt already exists

Mode	अर्थ
'r'	Read (default) - file न हो तो error
'w'	Write - existing content TRUNCATE (erase) करता है
'a'	Append - अंत में लिखता है, existing रखता है
'x'	Exclusive creation - पहले से हो तो error
'b'	Binary mode (जैसे 'rb', 'wb')

with open('data.txt', 'r') as f:
    content = f.read()

with open('data.txt', 'w') as f:
    f.write('New content')  # सावधान: पुराना सब erase होगा

with open('data.txt', 'a') as f:
    f.write('\nAppended line')

with open('image.png', 'rb') as f:
    binary_data = f.read()

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