Putting a variable into a string (quote) python-CodePudding

I am facing a problem while calling the variable values within the double quote

Here's my code:

AccountID = ["1234567","5678912"]
for account in range(len(AccountID)):
    response = sts.assume_role(RoleArn=(f"arn:aws:iam::{AccountID[account]}:role/Cloudbees_Jenkins"), RoleSessionName="learnaws-test-session")
    print(response)

I have return response output with no variable values

File "test3.py", line 19
    response = (RoleArn=(f"arn:aws:iam::{AccountID[account]}:role/Cloudbees_Jenkins"), RoleSessionName="learnaws-test-session")
                       ^
SyntaxError: invalid syntax

how would i return an expected results like:

arn:aws:iam::1234567:role/Cloudbees_Jenkins
arn:aws:iam::5678912:role/Cloudbees_Jenkins

CodePudding user response：

You could use f-strings, a very convenient way to refer to variables inside print statements in python.

In your case, it would look like this:

response = f"arn:aws:iam::{int(AccountID[0])}:role/Cloudbees_Jenkins"

CodePudding user response：

response = (RoleArn=(f"arn:aws:iam::{AccountID[account]}:role/Cloudbees_Jenkins"), RoleSessionName="learnaws-test-session")

The problem here has nothing to do with generating the string.

The problem is that in Python the = (assignment) operator does not produce an output value.

So the expression RoleArn = ...a_bunch_of_stuff... only assigns that stuff to RoleArn. It doesn't produce any output value that can be assigned to response.

And the assignement RoleSessionName="learnaws-test-session" doesn't produce any return value that can be assigned to be part of the tuple that is being assigned to RoleArn.

So just break the code up into three lines:

RoleSessionName="learnaws-test-session"
RoleArn= f"arn:aws:iam::{AccountID[account]}:role/Cloudbees_Jenkins"
response = (RoleArn, RoleSessionName)

In recent Python versions (3.8 and newer) you can use the "walrus operator" := to both assign a value and return that value to be used in an expression, but in your code you should not because it IMO makes the code less clear.

CodePudding user response：

AccountID =[1234567,5678912] for i in AccountID: print("arn:aws:iam::",i,"role/Cloudbees_Jenkins")