python - Invalid Syntax when F' string dictionary

Question

When I try to f'string dictionary, it says invalid syntax.

def up_low(s):
    d={"upper":0,"lower":0}
    for c in s:
        if c.isupper():
            d["upper"]+=1
            print (f"No. of Upper case characters: {d["upper"]}")
        elif c.islower():
            d["lower"]+=1
            print (f"No. of Lower case characters:{d["lower"]}")
        else:
            pass

it says invalid syntax for line 6 and line 9.

Answer 1

Don't use " in a string enclosed with ", either use ', or enclose the string in ':

f"No. of Upper case characters: {d['upper']}"

Or:

f'No. of Upper case characters: {d["upper"]}'