你能在函数中打印字典吗

Question

I have an input in a function, where it requires to print a dictionary and actually choose the number you want (based on your choice) however its not working for me.

def add_item():
        item = str(input("Gender>  "))
        types = int(input(print_nationality(), "Choice >"))
...


def print_nationality():
    dict = {
        1: "English",
        2: "American",
        3: "French",
        4: "Spanish"
    }
    for i in range(len(dict)):
        print(dict[i])

Answer 1

it works fine for me, the only modification I made is to discard 0 and start from 1 (and for good practice renamed the variable to name that is not type, well not recommended):

def print_nationality():
    m_dict = {
        1: "English",
        2: "American",
        3: "French",
        4: "Spanish"
    }
    for i in range(1,len(m_dict)+1):
        print(m_dict [i])
        
print_nationality()

output:

English
American
French
Spanish

Answer 2

You loop over the dictionary values (not over the index of the size of dictionary) and you have to call print_nationality() before and not inside the input(..) command:

def print_nationality():
    menu = {
        1: "English",
        2: "American",
        3: "French",
        4: "Spanish"
    }

    # directly iterate the keys of the dict
    for i in menu:
        print(f"{i}: {menu[i]}")

def add_item():
    item = str(input("Gender>  "))
    # print first, then ask for input
    print_nationality()        
    types = int(input("Choice >"))

should do it. Never name variables after built ins, your dict = .... hides the dict(..) built in.

Output:

Gender>  whatever
1: English
2: American
3: French
4: Spanish
Choice >

Answer 3

The correct way of iterating through a dictionary in python would be:

for key, item in m_dict.items():

The m_dict.items() will give you the possibility to use the key and the item in the for loop. In your case you could use it like this:

def print_nationality():
    dict = {
        1: "English",
        2: "American",
        3: "French",
        4: "Spanish"
    }
    for key, item in m_dict.items():
        print(item)

Source: Iterating over dictionaries using 'for' loops