I have a little python application, and declared at the top of the application a string called lastMsg, in a function, this string should be changed, but instead of changing the existing string, it creates a new string, how can I change the old string?
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4How about sharing your code?Fejs– Fejs2017-09-08 10:13:20 +00:00Commented Sep 8, 2017 at 10:13
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Can you not just assign the return value of the function to the variable? using globals is bad practice.cs95– cs952017-09-08 10:15:51 +00:00Commented Sep 8, 2017 at 10:15
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2 Answers
If I guessed correctly what you are trying to do (do share some code to further explain your answer):
You need to use the global keyword to specify you want to change the global variable.
myVar = "1"
def myFun():
global myVar
myVar = "2"
print(myVar)
myFun()
print(myVar)
Should print:
1
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Comments
It's not quite clear what you're asking.
I think you mean this:
lastMsg = "some string"
def a_function():
lastMsg = "new value"
If so, you can change it using the global keyword:
lastMsg = "some string"
def a_function():
global lastMsg
lastMsg = "new value"
