这个程序有什么问题？print（）函数中的语法错误

Question

为什么第18行出现语法错误？IDE说，print()函数有问题，但我不知道具体是什么。我将这个程序从C移植到Python，因为我正在学习Python。你知道吗

#caesar encipher
import sys
import cs50


if len(sys.argv)!= 2:
    print("Nope")

k = int(sys.argv[1])

if k<0:
    print("Nope")

else:
    code = cs50.get_string()
    #add k letters to each character in the string. For example is code[0]='a' and k=3, program will return 'd'.
    for i in code:
        if code[i].islower():
            new_code = chr((((ord(code[i]+k)- 97)% 26)+ 97)
            print(f"{new_code}")
        elif code[i].isupper():
            new_code = chr((((ord(code[i]+k)- 65)% 26)+ 65)
            print(f"{new_code}")
        else:
            print(code[i])
        print()

Answer 1

一定是这样

#caesar encipher
import sys
import cs50


if len(sys.argv)!= 2:
    print("Nope")

k = int(sys.argv[1])

if k<0:
    print("Nope")

else:
    code = cs50.get_string()
    #add k letters to each character in the string. For example is code[0]='a' and k=3, program will return 'd'.
    for i in code:
        if code[i].islower():
            new_code = chr((((ord(code[i]+k)- 97)% 26)+ 97))
            print("{new_code}")
        elif code[i].isupper():
            new_code = chr((((ord(code[i]+k)- 65)% 26)+ 65))
            print("{new_code}")
        else:
            print(code[i])
        print()