How to Read Input as a List

How To Input a List in Python?

Last updated on Dec 21,2021 121K Views

36 / 62 Blog from Python Fundamentals

Sometimes while coding in Python, you will need to take a list every bit an input. While this might sound simple at start, it is oftentimes regarded equally a complex task to accomplish for a beginner. This commodity volition tell you lot how to input a list in Python.

Post-obit pointers volition exist covered in this article,

• Input a Listing in Python
• Accept a listing of number as an input in Python
• Accept a List of Strings from the User
• Examples

So let us get started and so,

Input a List in Python

As yous might already know, in order to accept an input from the user in Python, we can make use of the input() office. When used, it enables the programmer to accept either a string, integer or even a graphic symbol as an input from the user. But when information technology comes to accepting a list as an input, the approach nosotros follow is slightly different.

This how to input a List in Python article, volition accost chief areas of concern

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Accept a listing of number as an input in Python

Take a look at the instance program below, which accepts a listing of numbers as an input in Python.

input_string = input("Enter a list chemical element separated past space ") listing  = input_string.split() print("Calculating sum of element of input list") sum = 0 for num in list:     sum += int (num) print("Sum = ",sum)

When the above programme is run, the output volition expect something similar this.

Output

Enter a listing element separated by space ii four 6 9

Calculating sum of chemical element of input list

Sum =  20

Analysis

Now let us breakdown the plan and see how the workings backside it.

1. As yous already know, whenever we use the input() function in Python, it converts the user input into a cord. Therefore in the to a higher place program, we accepted a list chemical element from a user in the form of a string which is separated by spaces.
2. One thing to annotation here, is that you have the ability to accept a string separated by the operator comma (,) as well. But in this situation you lot need to make employ of the split() office in order to pass the argument likewise as the separator in the Python program.
3. If yous look closely, you volition find that we have made apply of the part input_string.split() to split the input string separated by spaces from the user and converted them into private elements to be added into a listing.
4. We have also made employ of the For loop and converted every chemical element into an integer to summate its sum.

Moving on to the next topic of this commodity let u.s. see  how to input a listing in python that holds strings,

Accept a List of Strings from the User

Like to the above plan, we have the power to create a programme in Python to accept a listing of strings from the user. Have a expect at the case below to understand this amend.

input_string = input("Enter family members separated by comma ") family_list  = input_string.split(",") print("Printing all family member names") for name in family_list:     print(proper name)

When the to a higher place plan is run, the output will await something similar this.

Enter family members separated by comma: Julius,Mark,John

Printing all family unit member names

Juluis

Mark

John

Analysis

Let us breakdown the above programme into pointers and understand it better.

1. Similar to the earlier case, we accepted an input list from the user in the grade of a string separated by commas.
2. We have made utilise of the input_string.split(",") function to split the string separated past commas and catechumen it into a list of cord to be used in the programme.
3. Nosotros used a for loop and printed out all family names in social club, as you tin run across in the output shared to a higher place.

Moving on let us run across how this concept fares from programming perspective,

Examples

Let the states take a expect at a couple of other examples to empathise how to input a list in Python.

Example ane

# creating an empty list lst = [] # number of elemetns as input due north = int(input("Enter number of elements : ")) # iterating till the range for i in range(0, north):             ele = int(input())             lst.append(ele) # adding the element print(lst)

Output

Let u.s. take a look at the next example,

Example ii

# endeavour block to handle the exception  try: 	my_list = [] 	 	while Truthful:  		my_list.suspend(int(input())) 		 # if input is not-integer, but impress the list  except:  	impress(my_list)

Output

Example 3

# number of elements due north = int(input("Enter number of elements : ")) # Below line read inputs from user using map() role a = list(map(int,input("nEnter the numbers : ").strip().carve up()))[:n] print("nList is - ", a)

This would exist the terminal example of this commodity,

Instance 4

lst = [ ] n = int(input("Enter number of elements : ")) for i in range(0, north): ele = [input(), int(input())] lst.append(ele) impress(lst)

Output

This is information technology guys this brings us to the finish of this article on  How To Input A List In Python?

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