Question

phrase = input("Enter text to Cipher: ")
shift = int(input("Please enter shift: "))
encryption = input("Do you want to [E]ncrypt or [D]ecrypt?: ").upper

new_strs = []

for character in phrase:
    x = ord(character)
    if encryption == ("E"):
        new = x + shift
    if encryption == ("D"):
        new = x - shift

new_strs.append(chr(new))

print (("").join(new_strs))

只要我没有＆＃34，代码就可以工作;如果加密= E / D＆＃34;但如果我这样做，它就不会。

这是发生的错误消息。

Traceback (most recent call last):
 File "C:\Python34\Doc\test.py", line 14, in <module>
    new_strs.append(chr(new))
NameError: name 'new' is not defined

Answer 1

您遇到的问题是永远不会分配new。这是因为encryption == "E"为假，encription == "F"也是如此。它是错误的原因是加密是一个功能！尝试打印出来，你会看到。它是<function upper>。比较这两行

encryption = input("Do you want to [E]ncrypt or [D]ecrypt?: ").upper
encryption = input("Do you want to [E]ncrypt or [D]ecrypt?: ").upper()

第二个是正确的。这是你问题的根源。

正如其他答案所指出的，还有其他问题。将它们组合在一起，并添加加密的有效性检查，这是我的完整解决方案。

phrase = input("Enter text to Cipher: ")
shift = int(input("Please enter shift: "))
encryption = input("Do you want to [E]ncrypt or [D]ecrypt?: ").upper()
if encryption not in ("E", "F"):
    raise ValueError("invalid encryption type: %r" % encryption)

new_strs = []

for character in phrase:
    x = ord(character)
    if encryption == "E":
        new = x + shift
    if encryption == "D":
        new = x - shift

    new_strs.append(chr(new))

print (("").join(new_strs))

Answer 2

您需要在new_strs.append(chr(new))循环中包含for。而且你还需要在for循环中声明该变量。这完全取决于变量范围。如果你把new_strs.append(chr(new))放在for循环之外，python会在for循环之外寻找一个变量new，因为你只需要在for new变量中为new变量赋值。循环。

同样，您必须将一个空字符串分配给存在于for循环中的new变量，以便将if条件中存在的new值分配给变量if存在于for之外但位于for character in phrase: x = ord(character) new = 0 if encryption == ("E"): new = x + shift if encryption == ("D"): new = x - shift new_strs.append(chr(new))内。

$file   =   file_get_contents("text.txt");
// This explodes on new line
// As suggested by @Dagon, use of the constant PHP_EOL
// is a better option than \n for it's universality
$value  =   explode(PHP_EOL,$file);
// filter empty values
$array  =   array_filter($value);
// This splits the array into chunks of 3 key/value pairs
$array  =   array_chunk($array,3);

变数＆＃39;新＆＃39;没有定义

2 个答案: