问题
This question already has an answer here:
- Get a list of numbers as input from the user 16 answers
So I am taking raw_input as an input for some list.
x= raw_input()
Where I input 1 2 3 4
How will I convert it into a list of integers if I am inputting only numbers?
回答1:
Like this:
string_input = raw_input()
input_list = string_input.split() #splits the input string on spaces
# process string elements in the list and make them integers
input_list = [int(a) for a in input_list]
回答2:
list = map(int,raw_input().split())
We are using a higher order function map to get a list of integers.
回答3:
You can do the following using eval:
lst = raw_input('Enter your list: ')
lst = eval(lst)
print lst
This runs as:
>>> lst = raw_input('Enter your list: ')
Enter your list: [1, 5, 2, 4]
>>> lst = eval(lst)
>>> print lst
[1, 5, 2, 4]
>>>
回答4:
Here are some examples and brief explanation for Inputting Lists from users:
You may often need code that reads data from the console into a list. You can enter one data item per line and append it to a list in a loop. For example, the following code reads ten numbers one per line into a list.
lst1 = [] # Create an empty list
print("Enter 10 Numbers: ")
for i in range(10):
lst1.append(eval(input()))
print(lst1)
Sometimes it is more convenient to enter the data in one line separated by spaces. You can use the string’s split method to extract data from a line of input. For example, the following code reads ten numbers separated by spaces from one line into a list.
# Read numbers as a string from the console
s = input("Enter 10 numbers separated by spaces from one line: ")
items = s.split() # Extract items from the string
lst2 = [eval(x) for x in items] # Convert items to numbers
print(lst2)
Invoking input() reads a string. Using s.split() extracts the items delimited by
spaces from string s and returns items in a list. The last line creates a list of numbers by converting the items into numbers.
来源：https://stackoverflow.com/questions/23026324/how-to-make-a-list-from-a-raw-input-in-python