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str.startswith(substr, beg=0, end=len(string));

#!/usr/bin/python3

str = "this is string example....wow!!!"
print (str.startswith( 'this' ))   # Check if the string starts with 'this'
print (str.startswith( 'string', 8 ))  # Check if the string starting from the 9th character starts with 'string'
print (str.startswith( 'this', 2, 4 )) # Check if the string from the 2nd to the 4th character starts with 'this'

True
True
False