{"id":2440,"date":"2026-01-17T13:29:40","date_gmt":"2026-01-17T13:29:40","guid":{"rendered":"https:\/\/demo.materiamedica.net\/demo6\/?p=2440"},"modified":"2026-01-17T13:29:40","modified_gmt":"2026-01-17T13:29:40","slug":"python-list-comprehension","status":"publish","type":"post","link":"https:\/\/demo.materiamedica.net\/demo6\/python-list-comprehension\/","title":{"rendered":"Python – List Comprehension"},"content":{"rendered":"

1. What is List Comprehension?<\/h2>\n

List comprehension<\/strong> is a short and easy way<\/strong> to create a new list from an existing list.<\/p>\n

In simple words:
\n\ud83d\udc49 It lets you write less code<\/strong> to do the same work.<\/p>\n

2. Normal Way vs List Comprehension<\/h2>\n

Normal Way (Using Loop)<\/h3>\n
\n
\n
\n
<\/div>\n<\/div>\n<\/div>\n
numbers = [1<\/span>, 2<\/span>, 3<\/span>, 4<\/span>]
\nnew_numbers = []<\/p>\n

for<\/span> n in<\/span> numbers:
\n new_numbers.append(n * 2<\/span>)<\/p>\n

print<\/span>(new_numbers)
\n<\/code><\/div>\n<\/div>\n

List Comprehension Way<\/h3>\n
\n
\n
\n
<\/div>\n<\/div>\n<\/div>\n
numbers = [1<\/span>, 2<\/span>, 3<\/span>, 4<\/span>]
\nnew_numbers = [n * 2<\/span> for<\/span> n in<\/span> numbers]<\/p>\n

print<\/span>(new_numbers)
\n<\/code><\/div>\n<\/div>\n

\ud83d\udc49 Both give the same result<\/strong>, but list comprehension is shorter.<\/p>\n

3. Basic Syntax (Easy)<\/h2>\n
\n
\n
\n
<\/div>\n<\/div>\n<\/div>\n
new_list = [expression for item in old_list]
\n<\/code><\/div>\n<\/div>\n

4. Simple Example<\/h2>\n

Example<\/h3>\n
\n
\n
\n
<\/div>\n<\/div>\n<\/div>\n
fruits = [\"apple\"<\/span>, \"banana\"<\/span>, \"orange\"<\/span>]<\/p>\n

new_list = [fruit for<\/span> fruit in<\/span> fruits]<\/p>\n

print<\/span>(new_list)
\n<\/code><\/div>\n<\/div>\n

5. List Comprehension with Condition<\/h2>\n

You can add a condition using if<\/code>.<\/p>\n

Example<\/h3>\n
\n
\n
\n
<\/div>\n<\/div>\n<\/div>\n
numbers = [1<\/span>, 2<\/span>, 3<\/span>, 4<\/span>, 5<\/span>, 6<\/span>]<\/p>\n

even_numbers = [n for<\/span> n in<\/span> numbers if<\/span> n % 2<\/span> == 0<\/span>]<\/p>\n

print<\/span>(even_numbers)
\n<\/code><\/div>\n<\/div>\n

6. Change Values Using List Comprehension<\/h2>\n

Example<\/h3>\n
\n
\n
\n
<\/div>\n<\/div>\n<\/div>\n
names = [\"amit\"<\/span>, \"ravi\"<\/span>, \"sita\"<\/span>]<\/p>\n

new_names = [name.upper() for<\/span> name in<\/span> names]<\/p>\n

print<\/span>(new_names)
\n<\/code><\/div>\n<\/div>\n

7. List Comprehension with String<\/h2>\n

Example<\/h3>\n
\n
\n
\n
<\/div>\n<\/div>\n<\/div>\n
text = \"hello\"<\/span><\/p>\n

letters = [ch for<\/span> ch in<\/span> text]<\/p>\n

print<\/span>(letters)
\n<\/code><\/div>\n<\/div>\n

8. List Comprehension with Numbers<\/h2>\n

Example<\/h3>\n
\n
\n
\n
<\/div>\n<\/div>\n<\/div>\n
numbers = [10<\/span>, 20<\/span>, 30<\/span>]<\/p>\n

new_list = [n + 5<\/span> for<\/span> n in<\/span> numbers]<\/p>\n

print<\/span>(new_list)
\n<\/code><\/div>\n<\/div>\n

9. Using if\u2013else in List Comprehension<\/h2>\n

Example<\/h3>\n
\n
\n
\n
<\/div>\n<\/div>\n<\/div>\n
numbers = [1<\/span>, 2<\/span>, 3<\/span>, 4<\/span>]<\/p>\n

result = [\"even\"<\/span> if<\/span> n % 2<\/span> == 0<\/span> else<\/span> \"odd\"<\/span> for<\/span> n in<\/span> numbers]<\/p>\n

print<\/span>(result)
\n<\/code><\/div>\n<\/div>\n

10. Common Beginner Mistakes<\/h2>\n

\u274c Forgetting Brackets<\/h3>\n
\n
\n
\n
<\/div>\n<\/div>\n<\/div>\n
new_list = n * 2<\/span> for<\/span> n in<\/span> numbers
\n<\/code><\/div>\n<\/div>\n

\u2714 Correct:<\/p>\n

\n
\n
\n
<\/div>\n<\/div>\n<\/div>\n
new_list = [n * 2<\/span> for<\/span> n in<\/span> numbers]
\n<\/code><\/div>\n<\/div>\n

\u274c Making It Too Complex<\/h3>\n

Avoid very long list comprehensions at the beginning.<\/p>\n

11. Simple Practice Examples<\/h2>\n

Example 1: Square Numbers<\/h3>\n
\n
\n
\n
<\/div>\n<\/div>\n<\/div>\n
nums = [1<\/span>, 2<\/span>, 3<\/span>, 4<\/span>]<\/p>\n

squares = [n * n for<\/span> n in<\/span> nums]
\nprint<\/span>(squares)
\n<\/code><\/div>\n<\/div>\n

Example 2: Names with Letter A<\/h3>\n
\n
\n
\n
<\/div>\n<\/div>\n<\/div>\n
names = [\"Amit\"<\/span>, \"Ravi\"<\/span>, \"Anita\"<\/span>]<\/p>\n

a_names = [name for<\/span> name in<\/span> names if<\/span> \"A\"<\/span> in<\/span> name]
\nprint<\/span>(a_names)
\n<\/code><\/div>\n<\/div>\n

Example 3: Convert to String<\/h3>\n
\n
\n
\n
<\/div>\n<\/div>\n<\/div>\n
numbers = [1<\/span>, 2<\/span>, 3<\/span>]<\/p>\n

strings = [str<\/span>(n) for<\/span> n in<\/span> numbers]
\nprint<\/span>(strings)
\n<\/code><\/div>\n<\/div>\n

12. Summary (List Comprehension)<\/h2>\n

\u2714 Short way to create lists
\u2714 Cleaner than loops
\u2714 Can use conditions
\u2714 Easy to read if simple
\u2714 Very useful in Python<\/p>\n

\ud83d\udcd8 Perfect for Beginner eBook<\/h3>\n

This chapter is ideal for:<\/p>\n

    \n
  • \n

    Python beginner books<\/p>\n<\/li>\n

  • \n

    School & college students<\/p>\n<\/li>\n

  • \n

    Self-learners<\/p>\n<\/li>\n<\/ul>\n

    If you want next, I can write:<\/p>\n

      \n
    • \n

      Sort Lists<\/strong><\/p>\n<\/li>\n

    • \n

      Copy Lists<\/strong><\/p>\n<\/li>\n

    • \n

      Join Lists<\/strong><\/p>\n<\/li>\n

    • \n

      Tuple Basics<\/strong><\/p>\n<\/li>\n

    • \n

      List Exercises<\/strong><\/p>\n<\/li>\n<\/ul>\n

      Just tell me \ud83d\ude0a<\/p>\n","protected":false},"excerpt":{"rendered":"

      1. What is List Comprehension? List comprehension is a short and easy way to create a new list from an existing list. In simple words: \ud83d\udc49 It lets you write less code to do...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21],"tags":[],"class_list":["post-2440","post","type-post","status-publish","format-standard","hentry","category-python"],"_links":{"self":[{"href":"https:\/\/demo.materiamedica.net\/demo6\/wp-json\/wp\/v2\/posts\/2440","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/demo.materiamedica.net\/demo6\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/demo.materiamedica.net\/demo6\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/demo.materiamedica.net\/demo6\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/demo.materiamedica.net\/demo6\/wp-json\/wp\/v2\/comments?post=2440"}],"version-history":[{"count":1,"href":"https:\/\/demo.materiamedica.net\/demo6\/wp-json\/wp\/v2\/posts\/2440\/revisions"}],"predecessor-version":[{"id":2441,"href":"https:\/\/demo.materiamedica.net\/demo6\/wp-json\/wp\/v2\/posts\/2440\/revisions\/2441"}],"wp:attachment":[{"href":"https:\/\/demo.materiamedica.net\/demo6\/wp-json\/wp\/v2\/media?parent=2440"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/demo.materiamedica.net\/demo6\/wp-json\/wp\/v2\/categories?post=2440"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/demo.materiamedica.net\/demo6\/wp-json\/wp\/v2\/tags?post=2440"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}