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"]}'

Answer 2

Change your double quotes to single quotes inside {d["upper"]}

Here is full working code:

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

Answer 3

You can use any "other" string delimiter - even the triple ones:

d = {"k":"hello"}
print(f'''{d["k"]}''')
print(f"""{d["k"]}""")
print(f'{d["k"]}')
print(f"{d['k']}")

Output:

hello
hello
hello
hello

Using the same ones confuses python - it does not know where the f-string ends and your key-string starts if you use the same delimiters.