Hi There, In this post we’ll learn about python list comprehensions and it’s usage.

List comprehensions

List comprehensions are used for creating new list from another iterables.

List comprehensions for loop:

• Finding squares using For loop

    numbers = [1, 2, 3, 4, 5, 6]
    result = []
    for num in numbers:
       num = num * num
       result.append(num)
    print(result)
  

• OutPut for above Example code [1, 4, 9, 16, 25, 36]

• Using List comprehensions the above program can be written as follows

    numbers = [1, 2, 3, 4, 5, 6]
    result = [num*num for num in numbers]
    print(result)
  

• OutPut for above Example code [1, 4, 9, 16, 25, 36]

List comprehensions for loop and if condiation:

• Finding even numbers from given list

    numbers = [1, 2, 3, 4, 5, 6, 7, 8]
    result = []
    for num in numbers:
       if num % 2 == 0:
           result.append(num)
    print(result)
  

• OutPut for above Example code [2, 4, 6, 8]

• Using List comprehensions the above program can be written as follows

    numbers = [1, 2, 3, 4, 5, 6, 7, 8]
    result = [num for num in numbers if num % 2 == 0]
    print(result)
  

• OutPut for above Example code [2, 4, 6, 8]

List comprehensions for loop and if and else condiation:

• squre the number if it’s even else divide by 2

    numbers = [1, 2, 3, 4, 5, 6, 7, 8]
    result = []
    for num in numbers:
       if num % 2 == 0:
           result.append(num * 2)
       else:
           result.append(num / 2)
    print(result)
  

• OutPut for above Example code [0.5, 4, 1.5, 8, 2.5, 12, 3.5, 16]

• Using List comprehensions the above program can be written as follows

    numbers = [1, 2, 3, 4, 5, 6, 7, 8]
    result = [i for i in numbers if i % 2 == 0]
    print(result)
  

• OutPut for above Example code [0.5, 4, 1.5, 8, 2.5, 12, 3.5, 16]

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layout: post title: “Python list comprehensions and usage” categories: Python3-Tutorial tags: Python3-tutorials comments: true —

Hi There, In this post we’ll learn about python comprehensions

List comprehensions

List comprehensions are used for creating new list from another iterables.

List comprehensions for loop:

• Finding squares using For loop

    numbers = [1, 2, 3, 4, 5, 6]
    result = []
    for num in numbers:
       num = num * num
       result.append(num)
    print(result)
  

• OutPut for above Example code [1, 4, 9, 16, 25, 36]

• Using List comprehensions the above program can be written as follows

    numbers = [1, 2, 3, 4, 5, 6]
    result = [num*num for num in numbers]
    print(result)
  

• OutPut for above Example code [1, 4, 9, 16, 25, 36]

List comprehensions for loop and if condiation:

• Finding even numbers from given list

    numbers = [1, 2, 3, 4, 5, 6, 7, 8]
    result = []
    for num in numbers:
       if num % 2 == 0:
           result.append(num)
    print(result)
  

• OutPut for above Example code [2, 4, 6, 8]

• Using List comprehensions the above program can be written as follows

    numbers = [1, 2, 3, 4, 5, 6, 7, 8]
    result = [num for num in numbers if num % 2 == 0]
    print(result)
  

• OutPut for above Example code [2, 4, 6, 8]

List comprehensions for loop and if and else condiation:

• squre the number if it’s even else divide by 2

    numbers = [1, 2, 3, 4, 5, 6, 7, 8]
    result = []
    for num in numbers:
       if num % 2 == 0:
           result.append(num * 2)
       else:
           result.append(num / 2)
    print(result)
  

• OutPut for above Example code [0.5, 4, 1.5, 8, 2.5, 12, 3.5, 16]

• Using List comprehensions the above program can be written as follows

    numbers = [1, 2, 3, 4, 5, 6, 7, 8]
    result = [i for i in numbers if i % 2 == 0]
    print(result)
  

• OutPut for above Example code [0.5, 4, 1.5, 8, 2.5, 12, 3.5, 16]