f-string: unmatched '(' in line with function call

Question:

I’m trying to use f-strings in python to substitute some variables into a string that I’m printing, and I’m getting a syntax error.
Here’s my code:

print(f"{index+1}. {value[-1].replace("[Gmail]/", '')}")

I only started having the problem after I added the replace. I’ve checked plenty of times and I’m certain that I’m not missing a parenthesis. I know that there are plenty of other ways to accomplish this, some of which are probably better, but I’m curious why this doesn’t work.

Asked By: Cameron Delong

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Source

Answers:

Seems like this does not work

x = 'hellothere'
print(f"replace {x.replace("hello",'')}")

error

    print(f"replace {x.replace("hello",'')}")
                                ^
SyntaxError: f-string: unmatched '('

Try this instead

x = 'hellothere'
print(f"replace {x.replace('hello','')}")

single quotes 'hello'
output is

replace there
Answered By: Thavas Antonio

Your problem is double quotes inside double quotes.
For example,

  • OK –> f"hello ' this is good"
  • OK –> f'hello " this is good'
  • ERROR –> f"hello " this breaks"
  • ERROR –> f'hello ' this breaks'

This one should work correctly:

print(f"{index+1}. {value[-1].replace('[Gmail]/', '')}")

Out of scope but still I do not advise you to use replace inside f-string. I think that it would be better to move it to a temp variable.

Answered By: Oleksandr Dashkov

Another way to do some string formatting (which in my opinion improves readability) :

print("{0}. {1}".format(index+1, 
                        value[-1].replace("[Gmail]/", "")))
Answered By: Charles Dupont

I had the same issue,change all the double quote within the parenthesis to single quotes.It should work
eg from
print( f" Water : {resources["water"] } " )
to
print( f" Water : {resources[‘water’] } " )

Answered By: user17597998