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In the actual development process , You will often encounter many identical or very similar operations , At this time , Code that implements similar operations can be encapsulated as functions , Then call the function where you need it . This can not only realize code reuse , It can also make the code more organized , Increase code reliability . Now let's introduce python Function local variables and global variables .
So called local variables , It refers to the variables defined in the function , Can only be used within a function , It has nothing to do with other variables with the same name outside the function . In different functions , You can use local variables with the same name , They represent different objects , Mutual interference . Besides , The formal parameters of a function also belong to local variables , The scope is limited to the inside of the function .
Variables defined outside the function are called global variables , Global variables are valid throughout the program .
example ： Analyze the running results of the following programs .
total = 0 # Global variables total
def sum( arg1, arg2 ): # return 2 The sum of parameters
total = arg1 + arg2 # local variable total
print (" Function is a local variable : ", total) # Output local variable total Value
return total
sum(10, 20) # call sum function
print (" Outside the function is the global variable : ", total) # Output global variables total Value
give the result as follows .
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