A list is an ordered combination of different types of elements. There are several ways through which we can iterate over a list. The methods we‘ll discuss are as follows:

- Using for Loop
- Using the range () method
- Using while loop
- Using List Comprehension
- Using enumerate () method
- Using the NumPy module function

## Using for loop

By using for loop we can easily iterate elements of a list. Let’s consider this by an example given below.

nl= [10, 20, 30, 40, 50, 60] print("list items are as follows:") for i in nl: print(i)

**Output:**

list items are as follows:

10

20

30

40

50

60

**Output:**

In figure 1 we have used for loop to iterate list items containing numbers. The print function displays all elements of the list accessed by for loop as shown in figure 2.

## Using range() method:

In this method, we use the range function in combination with for loop. Let’s consider this by the example given below.

nl= [10, 20, 30, 40, 50, 60] for i in range(len(nl)): print("list item",i, "is:",nl[i])

**Output:**

list item 0 is: 10

list item 1 is: 20

list item 2 is: 30

list item 3 is: 40

list item 4 is: 50

list item 5 is: 60

**Output:**

In figure 3 range function is used and the length of the list is given as a stop parameter for the range function. Figure 4 tells that every element is displayed with an index as output.

## Using while Loop

While loop can also be used to iterate list elements. Let’s consider this by example given below.

wk_days = ["Monday", "Tuesday", "Wednesday", "Thursday","Friday"] i = 0 while i < len(wk_days): print(wk_days[i]) i = i + 1

**Output:**

Monday

Tuesday

Wednesday

Thursday

Friday

**Output:**

In the above figure 5, we have a list of weekdays. While loop compares the length of the list with variable i and prints days name one by one as shown in figure 6.

## Using List Comprehension

In this method, we‘ll use List comprehension. It is the shortest and most tricky way. Let’s consider this by the example given below.

ns_list = [10, "ten", 20, "twenty", 30, "thirty", 40, "forty"] [print(n) for n in ns_list]

**Output:**

10

ten

20

twenty

30

thirty

40

forty

**Output:**

In figure 7 we have a list containing string integers and strings. We can iterate the list items as shown in figure 8.

## Using enumerate() method

alist = [1, 'number', 1.0, 'float', 'a', 'string'] for index, value in enumerate(alist): print(index, ":", value)

**Output:**

0 : 1

1 : number

2 : 1.0

3 : float

4 : a

5 : string

**Output:**

In figure 9 we have used enumerate function which displays the index number and value. We get output as shown in figure 10.

## Using the numpy module function

import numpy as np new_list = np.array([1, 'number', 1.0, 'float', 'a', 'string']) for x in np.nditer(new_list): print(x)

**Output:**

1

number

1.0

float

a

string

**Output:**

To use the NumPy functions first thing we do is import the NumPy module. NumPy module has nditer() function that iterates the elements of the list.

Karim Buzdar holds a degree in telecommunication engineering and holds several sysadmin certifications including CCNA RS, SCP, and ACE. As an IT engineer and technical author, he writes for various websites.