如何检查字符串中的字符是否在值字典中？

Question

我想检查任何给定字符串中的字符是否列在我创建的值字典（作为键）中，我该怎么做？

Answer 1

Use any or all depending on whether you want to check if any of the characters are in the dictionary, or all of them are. Here's some example code that assumes you want all :

>>> s='abcd'
>>> d={'a':1, 'b':2, 'c':3}
>>> all(c in d for c in s)
False

Alternatively you might want to get a set of the characters in your string that are also keys in your dictionary:

>>> set(s) & d.keys()
{'a', 'c', 'b'}

Answer 2

string = "hello" 
dictionary = {1:"h", 2:"e", 3:"q"}
for c in string:
    if c in dictionary.values():
        print(c, "in dictionary.values!")

If you wanted to check if c is in the keys, use dictionary.keys() instead.

Answer 3

[char for char in your_string if char in your_dict.keys()]

this will give you a list of all chars in your string that are present as keys in your dictionary.

Eg.

your_dict = {'o':1, 'd':2, 'x':3}
your_string = 'dog'
>>> [char for char in your_string if char in your_dict.keys()]
['d', 'o']