Q:

Remove falsy values from a list in Python

belongs to collection: Python List Programs

mahmoud2506
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2022-05-22
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In python, the values that evaluate to False are considered Falsy values. The values are False, None, 0 and "".

Here, we are implementing a python program to remove the falsy values from a string. To remove these values we are using filter() method, it will filter out the falsy values.

Example:

    Input:
    [10, 20, 0, 30, 0, None]

    Output:
    [10, 20, 30]

    Input: 
    [False, None, 0, "", "Hello", 10, "Hi!"]
    
    Output: 
    ['Hello', 10, 'Hi!']
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mahmoud2506
2022-05-22
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Program:

# Remove falsy values from a list in Python 
def newlist(lst):
  return list(filter(None, lst))

# main code
list1 = [10, 20, 0, 30, 0, None]
list2 = [40, False, "Hello", "", None]
list3 = [False, None, 0, "", "Hello", 10, "Hi!"]

# printing original strings
print("list1: ", list1)
print("list2: ", list2)
print("list3: ", list3)

# removing falsy values and printing
print("newlist(list1): ", newlist(list1))
print("newlist(list2): ", newlist(list2))
print("newlist(list3): ", newlist(list3))

Output

list1:  [10, 20, 0, 30, 0, None]
list2:  [40, False, 'Hello', '', None]
list3:  [False, None, 0, '', 'Hello', 10, 'Hi!']
newlist(list1):  [10, 20, 30]
newlist(list2):  [40, 'Hello']
newlist(list3):  ['Hello', 10, 'Hi!']

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