CODEWITHSUNDEEP
pythonloops
user5977110
user5977110

Reputation: 131

Python Iterating over variables

I want to write a for loop that iterates over variables and updates their values. for example:

x = 1
y = 1
for varNames in [x,y]:
    varNames = varNames + 1
print(x)
print(y)

Here I want to have the function print the value 2 for both x and y, but my output is still 1. It is because the varNames variable gets updated but not x and y. How do I update the values for actual variable names x and y?

Thanks for the help!

Upvotes: 0

Views: 518

Answers (2)

Alain T.
Alain T.

Reputation: 42139

At the global level (i.e. not within a function) you could do this using the globals() function. 

x = 1
y = 1
for varName in ["x","y"]:
    globals()[varName] += 1
print(x) # 2
print(y) # 2

However, if you need to do that kind of thing in your program, you might want to learn more about lists and dictionaries which would be the preferred approach.

data = dict()
data["x"] = 1
data["y"] = 1
for varName in data:
    data[varName] = data[varName] + 1
print(data["x"]) # 2
print(data["y"]) # 2

Upvotes: 4

chrisans
chrisans

Reputation: 37

You can just make a list containing the variables and then you can iterate over them and print each object of the list. 

x = 1 
y = 3
mylist=[x,y]
for index in mylist:
    print(index)

Upvotes: -1

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