[英]Unable to write condition to update dictionary value in python
请帮忙! 如何在我现有的代码中编写条件,将检查如下。 请看注释块。 我无法在字典/列表中附加值。 我需要编写/更改什么?
我的尝试:
import Encrypt
from collections import defaultdict
key_value_dict = {}
def encrypt_file():
try:
txtfile = input("Your plain txt file that you want to encrypt : ")
encrypt_file = input("Directory to save the encrypted file : ")
key = input("Key for encryption : ")
# process for encryption
Encrypt.encrypt_file(txtfile, encrypt_file, key)
# ----------------------------------------------------------------
key_value_dict = defaultdict(list, {key: encrypt_file})
print(key_value_dict)
key_value_dict [key].append(encrypt_file)
print(key_value_dict )
# --------------------------------------------------------------------
except FileNotFoundError:
print("File Not Found!")
def menu():
selection = True
while selection:
print("""
MAIN MENU:
[1] Encrypt files using existing keys.
[2] Exit.
""")
try:
selection = input("Please select : ")
if selection == "1":
encrypt_file() # call function
elif selection == "2":
print("\n[4] Keys are used for encryption:", "\n", key_value_dict)
selection = None
else:
print("\n Invalid selection! Try again")
except ValueError:
print("\n Exception: Invalid user input!")
# Main function
if __name__ == '__main__':
menu()
如果我理解正确,我认为您不需要 defaultdict
尝试这个:
# define this first outside the function like you have
encrypt_key_value_dict = {}
# Within your code block, get rid of the assignment to default dict
if encrypt_key_value_dict[key]:
encrypt_key_value_dict.append(encrypt_file)
else:
encrypt_key_value_dict[key] = [encrypt_file]
我无法从您的代码中看到您的密钥在哪里被传递等,但我相信您可以弄清楚。
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