- Data Structure
- Networking
- RDBMS
- Operating System
- Java
- MS Excel
- iOS
- HTML
- CSS
- Android
- Python
- C Programming
- C++
- C#
- MongoDB
- MySQL
- Javascript
- PHP
- Physics
- Chemistry
- Biology
- Mathematics
- English
- Economics
- Psychology
- Social Studies
- Fashion Studies
- Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Iterate over a list in Python
In this article, we will learn about iterating/traversing over a list in Python 3.x. Or earlier.
A list is an ordered sequence of elements. It is a non-scalar data structure and mutable in nature. A list can contain distinct data types in contrast to arrays storing elements belonging to the same data types.
Method 1 − Using iterable without index
Example
list_inp = ['t','u','t','o','r','i','a','l','s','p','o','i','n','t'] # Iterate over the list for value in list_inp: print(value, end='')
Method 2 − Using general way via index
Example
list_inp = ['t','u','t','o','r','i','a','l','s','p','o','i','n','t'] # Iterate over the list for value in range(0,len(list_inp)): print(list_inp[value], end='')
Method 3 − Using the enumerate type
Example
list_inp = ['t','u','t','o','r','i','a','l','s','p','o','i','n','t'] # Iterate over the list for value,char in enumerate(list_inp): print(char, end='')
Method 4 − Using negative indexes
Example
list_inp = ['t','u','t','o','r','i','a','l','s','p','o','i','n','t'] # Iterate over the list for value in range(-len(list_inp),0): print(list_inp[value], end='')
All the above four methods yeilds the output displayed below.
Output
tutorialspoint
Method 5 − Using sliced lists
Example
list_inp = ['t','u','t','o','r','i','a','l','s','p','o','i','n','t'] # Iterate over the list for value in range(1,len(list_inp)): print(list_inp[value-1:value], end='') print(list_inp[-1:])
Output
['t']['u']['t']['o']['r']['i']['a']['l']['s']['p']['o']['i']['n']['t']
Conclusion
In this article, we learnt about iteration/traversal over a list data type. Also, we learnt about various implementation techniques.
Advertisements