python Three Ways to Delete List Elements of remove pop del

remove Delete a single element, delete the first qualified element, delete by value, return value is null

List_remove = [1, 2, 2, 2, 3, 4]
print(List_remove.remove(2))
print("after remove", List_remove)
# None
# after remove [1, 2, 2, 3, 4]

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pop Delete the index position element, delete the last element without parameters, and return the deleted element value

List_pop = [1, 2, 2, 2, 3, 4]
print(List_pop.pop(1)) #  Returns the value of the deleted element 
print("after pop", List_pop)
# 2
# after pop [1, 2, 2, 3, 4]

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del Deletes a single value or a value within a specified range according to the index position

Use the del statement to delete individual elements

List_del_1 = [1, 2, 2, 2, 3, 4]
del List_del_1[1]
print("after del List_del_1", List_del_1)
# after del List_del_1 [1, 2, 2, 3, 4]

Use the del statement to delete a value within the specified range

List_del_2 = [1, 2, 2, 2, 3, 4]
del List_del_2[2:4] #  Delete [2,4) Values in the index range 
print("after del List_del_2", List_del_2)
# after del List_del_2 [1, 2, 3, 4]

del Deletes entire data objects (lists, collections, etc.)

List_del_3 = [1, 2, 2, 2, 3, 4]
del List_del_3
# print(List_del_3) #  Object not found after deletion 
# NameError: name 'List_del_3' is not defined
#  Note: del Is to delete the reference ( Variable ) Instead of deleting objects ( Data ) Objects are created by the automatic garbage collection mechanism ( GC ) Delete