python - 函数内的 Python For 循环错误

Question

所以我试图更好地理解函数并使用 for 循环从多个列表中进行选择。这是我创建的基本函数，它确实有效:

def my_function(person, feeling):
    print('Hello, %s, how are you? It seems that you are feeling %s!' %(person, feeling))

my_function('Matthew', 'rejuvinated')

但更进一步，我想从它们各自的列表中选择一个名称和一种感觉，并将它们插入到新函数中。当我尝试以下操作时，出现错误。任何帮助将不胜感激!

people = ['Colby', 'Hattie', 'Matthew', 'Stephen', 'Lee', 'Deb', 'Sharon', 'Pete']
feelings = ['happy', 'sad', 'cold', 'cranky', 'happy', 'successful', 'spunky', 'warm', 'nerdy']

def my_function(person, feeling): 
    """This function produces a statement which inserts a name and a feeling"""
    for p in enumerate(people):
            person = p
    for f in enumerate(feelings):
            feeling = f
    print('Hello, %s, how are you? It seems that you are feeling %s!' %(person, feeling)) 
    return my_function()

my_function(people, feelings)

Hello, (7, 'Pete'), how are you? It seems that you are feeling (8, 'nerdy')!
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-1-2b2a265c427c> in <module>
     11     return my_function()
     12 
---> 13 my_function(people, feelings)

<ipython-input-1-2b2a265c427c> in my_function(person, feeling)
      9             feeling = f
     10     print('Hello, %s, how are you? It seems that you are feeling %s!' %(person, feeling))
---> 11     return my_function()
     12 
     13 my_function(people, feelings)

TypeError: my_function() missing 2 required positional arguments: 'person' and 'feeling'

Answer 1

两个循环同时使用两个列表，zip :

peoples = ['Colby', 'Hattie', 'Matthew', 'Stephen', 'Lee', 'Deb', 'Sharon', 'Pete']
feelings = ['happy', 'sad', 'cold', 'cranky', 'happy', 'successful', 'spunky', 'warm', 'nerdy']

def my_function(persons, feelings):
    """This function produces a statement which inserts a name and a feeling"""
    # python provide a zip built-in function to loop over multiple list in the same time
    for person, feeling in zip(persons, feelings):
        # print the message for every element
        print('Hello, %s, how are you? It seems that you are feeling %s!' %(person, feeling))

my_function(peoples, feelings)

The zip() function takes:

iterables - can be built-in iterables (like: list, string, dict), or user-defined iterables (object that has __iter__ method)

The zip() function returns an iterator of tuples based on the iterable object.

• If no parameters are passed, zip() returns an empty iterator
• If a single iterable is passed, zip() returns an iterator of 1-tuples. Meaning, the number of elements in each tuple is 1.
• If multiple iterables are passed, ith tuple contains ith Suppose, two iterables are passed; one iterable containing 3 and other containing 5 elements. Then, the returned iterator has 3 tuples. It's because iterator stops when shortest iterable is exhaused.