sum.py源代码分析

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# Fig. 2.7: fig02_07.py

# Simple addition program.

# prompt the user for input

integer1 = raw_input( "Enter first integer:\n" ) # read a string

integer1 = int( integer1 ) # convert the string to an integer

integer2 = raw_input( "Enter second integer:\n" ) # read a string

integer2 = int( integer2 ) # convert the string to an integer

sum = integer1 + integer2 # assignment of sum

print "Sum is", sum # print sum

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