It acts as curly bracket. We have to keep the number of white spaces consistent through out the program.
Example 1:
def main():
print "we are in main function"
print "print 2nd line"
main()
Result:
We are in main function
print 2nd line
Example 2:
def main():
print "we are in main function"
print "print 2nd line"
main()
Result:
print 2nd line
We are in main function
Here, in the 1st program, both the statement comes under the main function since both have equal number of white spaces while in the 2nd program, the 1st line is printed later because the main function is called after the 2nd line Note - The 2nd line has no white space, so it is independent of the main function.