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os.ftruncate(fd, length)¶

#!/usr/bin/python3

import os, sys

# Open a file
fd = os.open("foo.txt", os.O_RDWR|os.O_CREAT)

# Write a string
os.write(fd, "This is test - This is test")

# Use the ftruncate() method
os.ftruncate(fd, 10)

# Read the content
os.lseek(fd, 0, 0)
str = os.read(fd, 100)
print("The read string is : ", str)

# Close the file
os.close(fd)

print("Closed the file successfully!!")

The read string is :  This is te
Closed the file successfully!!