<p>我一直在用python做一个简单的Caesar转换,但是当我试着运行它时,它说:</p>
<pre><code>File "Ceaser Shift.py", line 36, in main
ciphertext += shift(letter,shift)
TypeError: 'str' object is not callable
</code></pre>
<p>我试图弄清楚它为什么会这样做,我可以在正常的空闲环境中添加到字符串中,但没有看到任何联机的相关内容,因为我没有在脚本的任何地方重新定义str。
任何帮助都太好了!你知道吗</p>
<p>我的代码:</p>
<pre><code>## Doesn't support changing shifts during computation, to do this either the database must be re-written or script restarted
import time, os, string
global selmemo
shiftmemo = {}
def shift(l,shift):
if l not in shiftmemo:
charset = list(string.ascii_lowercase)
place = charset.index(l.lower())
shiftplace = charset.index(shift.lower())
shiftmemo[l] = charset[(place+shiftplace)%25]
return shiftmemo[l]
def main():
shift = None
ciphertext = ""
print("--- Welcome ---")
print("--- Ceaser Shifter ---")
print("Commands: shift, encrypt, clear, print, quit")
choice = input(": ")
while choice != "quit":
if choice == "shift":
shift = input("Please enter a shift letter: ")
elif choice == "encrypt" and shift != None:
uparse = input("Enter your plaintext: ")
for letter in uparse:
if letter.lower() in string.ascii_lowercase:
ciphertext += shift(letter,shift)
else:
ciphertext += letter
elif choice == "clear":
shift = ""
ciphertext = ""
shiftmemo = {}
elif choice == "print":
print(ciphertext)
else:
pass
choice = input(": ")
main()
</code></pre>