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fileObject.truncate([size])

1:www.tutorialpro.org
2:www.tutorialpro.org
3:www.tutorialpro.org
4:www.tutorialpro.org
5:www.tutorialpro.org

#!/usr/bin/python3

fo = open("tutorialpro.txt", "r+")
print("File Name: ", fo.name)

line = fo.readline()
print("Read Line: %s" % (line))

fo.truncate()
line = fo.readlines()
print("Read Line: %s" % (line))

# Close the file
fo.close()

File Name:  tutorialpro.txt
Read Line: 1:www.tutorialpro.org

Read Line: ['2:www.tutorialpro.org\n', '3:www.tutorialpro.org\n', '4:www.tutorialpro.org\n', '5:www.tutorialpro.org\n']

#!/usr/bin/python3

# Open the file
fo = open("tutorialpro.txt", "r+")
print("File Name: ", fo.name)

# Truncate to 10 bytes
fo.truncate(10)

str = fo.read()
print("Read Data: %s" % (str))

# Close the file
fo.close()

File Name:  tutorialpro.txt
Read Data: 1:www.runo