how to read a text file line by line in python
# Open the file with read only permit
f = open('my_text_file.txt')
# use readline() to read the first line
line = f.readline()
# use the read line to read further.
# If the file is not empty keep reading one line
# at a time, till the file is empty
while line:
# in python 2+
# print line
# in python 3 print is a builtin function, so
print(line)
# use realine() to read next line
line = f.readline()
f.close()Writing Line to a Text file in python
# Open a file for writing and insert some records
>>> f = open('test.txt', 'w')
>>> f.write('applen')
>>> f.write('orangen')
>>> f.write('pearn')
>>> f.close() # Always close the file
# Check the contents of the file created
# Open the file created for reading and read line(s) using readline() and readlines()
>>> f = open('test.txt', 'r')
>>> f.readline() # Read next line into a string
'applen'
>>> f.readlines() # Read all (next) lines into a list of strings
['orangen', 'pearn']
>>> f.readline() # Return an empty string after EOF
''
>>> f.close()
# Open the file for reading and read the entire file via read()
>>> f = open('test.txt', 'r')
>>> f.read() # Read entire file into a string
'applenorangenpearn'
>>> f.close()
# Read line-by-line using readline() in a while-loop
>>> f = open('test.txt')
>>> line = f.readline() # include newline
>>> while line:
line = line.rstrip() # strip trailing spaces and newline
# process the line
print(line)
line = f.readline()
apple
orange
pear
>>> f.close()Copyright © 2021 Codeinu
Forgot your account's password or having trouble logging into your Account? Don't worry, we'll help you to get back your account. Enter your email address and we'll send you a recovery link to reset your password. If you are experiencing problems resetting your password contact us
