Remove the first element from a list in Python
This tutorial will discuss different ways on how to remove the first element from a list.
pop()
Remove the first element from a list using the
pop()
Method can remove an element from a specific index. We have to specify the index from which the element is to be removed.
In our case, we have to remove the first element, so we have to use indexing 0
.
For example,
list1 = ["ram", "ravi", "shyaam"]
list1.pop(0)
print(list1)
Output:
['ravi','shyaam']
If index is not specified, removes the last element.
remove()
Remove the first element from a list using the
remove
method can remove any required element from the list. Here, we have to write the name of the element to be removed instead of its index.
In our case, we will write the first element of the list.
For example,
list1 = ["ram", "ravi", "shyaam"]
list1.remove("ram")
print(list1)
Output:
['ravi','shyaam']
Assume that we don't know the first element and checking again and again may be time consuming. To avoid this, we can also use remove()
method in the following way.
list1 = ["ram", "ravi", "shyaam"]
list1.remove(list1[0])
print(list1)
Output:
['ravi','shyaam']
del
Deleting elements from a list using keyword in Python
del
The keyword also removes the element from a specific index. We will write 0 in the brackets as it specifies the first element in the list.
For example,
list1 = ["ram", "ravi", "shyaam"]
del list1[0]
print(list1)
Output:
['ravi','shyaam']
Remove the first element from a list using list slicing in Python
We can also use the slice method to remove the first element. This method is the most common way programmers solve this problem.
Here, we specify the starting element we want the list to have and the desired last value. In our case, we will start at index 1 and end at n-1 by removing the first element.
Please refer to the code below.
list1 = ["ram", "ravi", "shyaam"]
list1 = list1[1:]
print(list1)
Output:
['ravi','shyaam']
Use numpy.delete()
the function to remove the first element from a list in Python
We can use the function NumPy
from the module delete()
. First, we numpy.array()
convert the list to an array using the function and then delete()
remove the required elements using the method.
For example,
import numpy as np
list1 = ["ram", "ravi", "shyaam"]
arr = np.array(list1)
arr = np.delete(arr, 0)
print(arr)
Output:
['ravi','shyaam']
popleft()
Remove the first element from a list using the function in Python
popleft()
The function removes the elements one by one from the beginning. But first, we convert the list into a deque and then use this method. After the required transformation, we reverse the deque back into a list and then print the output.
The module needs to be imported before collections
this method can be used.
Please refer to the code below.
import collections
list1 = ["ram", "ravi", "shyaam"]
# convert list to deque
deq = collections.deque(list1)
# removing from left side
deq.popleft()
# convert deque back to list
list1 = list(deq)
print(list1)
Output:
['ravi', 'shyaam']
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