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+--- Thread: Variable Not Updating (/thread-27468.html)
Variable Not Updating - NectDz - Jun-07-2020
Hello, Im having a problem with my function. It is supposed to out put '01' if the user only puts 1 digit but when I call it in the engine function it does not update.
def engine():
m = int(input("Type the Mintue: "))
m = str(m)
check(m)
print(m)
def check(m):
if len(m) != 2:
for num in m:
m = "0" + str(m)
return
RE: Variable Not Updating - bowlofred - Jun-07-2020
Strings in python are immutable. If you try to change them, you end up making a changed copy, not changing the original.
Therefore the
check() function above does nothing. When you attempt to change it on line 10, it changes a copy. The m in engine() isn't touched.If you want to change a string in a function, you probably want to return the changes and have the caller accept them.
def check(m):
if len(m) != 2:
for num in m:
m = "0" + str(m)
return m
m = check(m)