如何从带有特定项目的输入中打印列表

Question

How to print list with from input with specific items? For example with names which ends with x. I've got this code

while True:
    name = input("Enter your name: ")
    if name == "":
        break
    list = []
    namex = name.endswith("x")
    if name == namex:
        list.append(name)
    print (list)

but when i try to print list it gives me nothing:

>>> Enter your name: alex
    Enter your name: james
    Enter your name: abcx
    Enter your name: 
>>>

Answer 1

Your issue is that namex is a boolean , not a string .

>>> 'abc'.endswith("x")
False
>>> 'abcx'.endswith("x")
True

This means that any equality comparison between a string and a boolean will return false. You want to trigger the "if" statement if the statement ends with "x", or:

names = []
while True:
    name = input("Enter your name: ")
    if name == "":
        break
    namex = name.endswith("x")
    # namex is a boolean type, which if it is True, will trigger an if statement
    if namex:
        names.append(name)
print(names)

Answer 2

namex = name.endswith("x")
if name == namex:

Does not do what you think it does. name.endswith("x") returns True or False . Should be

if name.endswith("x"):

instead.

names = []
while True:
    name = input("Enter your name: ")
    if name == "":
        break
    if name.endswith("x"):
        names.append(name)
print (names)

List comprehension iter version:

>>> [name for name in iter(input, '') if name.endswith('x')]
dsf
sdfdsf
dsffdx
sx

['dsffdx', 'sx']

Answer 3

Here, I am storing all the names ending with 'x' in namex_list instead of using the list (also a built-in variable) variable you used before.

Also, i am assigning namex_list as an empty list before the while condition and printing the namex_list at the end outside of while .

namex_list = []
while True:
    name = input("Enter your name: ")
    if name == "":
        break     
    if name.endswith("x"):
        namex_list.append(name)
print (namex_list)

Also, name == namex does not check what you are trying to achieve because of the comparison between string values and boolean values.

For example:

>>> name1 = 'abc'
>>> name2 = 'abcx'
>>> namex1 = name1.endswith('x')
>>> namex2 = name2.endswith('x')

>>> namex1
False
>>> namex2
True

>>> name1 == namex1    
False
>>> name2 == namex2
False

You should use an if instead to achieve what you are trying to achieve in your code above:

if name.endswith("x"):