A list<\/strong> is a collection of many values stored in one variable<\/strong>.<\/p>\n In simple words: Lists help us:<\/p>\n Store many values together<\/p>\n<\/li>\n Access items easily<\/p>\n<\/li>\n Change items when needed<\/p>\n<\/li>\n<\/ul>\n Lists are written using square brackets Each item in a list has a position number<\/strong> (index).<\/p>\n Index starts from 0<\/strong>.<\/p>\n print<\/span>(fruits[0<\/span>]) # apple<\/span> Negative index starts from the end<\/strong>.<\/p>\n Lists are changeable (mutable)<\/strong>.<\/p>\n Use \u274c Error: index out of range.<\/p>\n \u2714 Correct:<\/p>\n \u2714 Lists store many values This chapter is ideal for:<\/p>\n Python beginner books<\/p>\n<\/li>\n School & college students<\/p>\n<\/li>\n Self-learners<\/p>\n<\/li>\n<\/ul>\n If you want next, I can write:<\/p>\n List Methods (in detail)<\/strong><\/p>\n<\/li>\n List Exercises<\/strong><\/p>\n<\/li>\n Tuples<\/strong><\/p>\n<\/li>\n Sets<\/strong><\/p>\n<\/li>\n Dictionaries<\/strong><\/p>\n<\/li>\n<\/ul>\n Just tell me \ud83d\ude0a<\/p>\n","protected":false},"excerpt":{"rendered":" 1. What is a List? A list is a collection of many values stored in one variable. In simple words: \ud83d\udc49 A list is like a box that can hold many items. Example fruits...<\/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-2428","post","type-post","status-publish","format-standard","hentry","category-python"],"_links":{"self":[{"href":"https:\/\/demo.materiamedica.net\/demo6\/wp-json\/wp\/v2\/posts\/2428","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=2428"}],"version-history":[{"count":1,"href":"https:\/\/demo.materiamedica.net\/demo6\/wp-json\/wp\/v2\/posts\/2428\/revisions"}],"predecessor-version":[{"id":2429,"href":"https:\/\/demo.materiamedica.net\/demo6\/wp-json\/wp\/v2\/posts\/2428\/revisions\/2429"}],"wp:attachment":[{"href":"https:\/\/demo.materiamedica.net\/demo6\/wp-json\/wp\/v2\/media?parent=2428"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/demo.materiamedica.net\/demo6\/wp-json\/wp\/v2\/categories?post=2428"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/demo.materiamedica.net\/demo6\/wp-json\/wp\/v2\/tags?post=2428"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n\ud83d\udc49 A list is like a box that can hold many items<\/strong>.<\/p>\nExample<\/h3>\n
fruits = [\"apple\"<\/span>, \"banana\"<\/span>, \"orange\"<\/span>]
\nprint<\/span>(fruits)
\n<\/code><\/div>\n<\/div>\n2. Why Use Lists?<\/h2>\n
\n
3. Creating a List<\/h2>\n
[ ]<\/code><\/strong>.<\/p>\nExample<\/h3>\n
numbers = [10<\/span>, 20<\/span>, 30<\/span>, 40<\/span>]
\nnames = [\"Amit\"<\/span>, \"Ravi\"<\/span>, \"Sita\"<\/span>]
\n<\/code><\/div>\n<\/div>\n4. Accessing List Items (Index)<\/h2>\n
Example<\/h3>\n
fruits = [\"apple\"<\/span>, \"banana\"<\/span>, \"orange\"<\/span>]<\/p>\n
\nprint<\/span>(fruits[1<\/span>]) # banana<\/span>
\nprint<\/span>(fruits[2<\/span>]) # orange<\/span>
\n<\/code><\/div>\n<\/div>\n5. Negative Indexing<\/h2>\n
Example<\/h3>\n
print<\/span>(fruits[-1<\/span>]) # orange<\/span>
\nprint<\/span>(fruits[-2<\/span>]) # banana<\/span>
\n<\/code><\/div>\n<\/div>\n6. Changing List Items<\/h2>\n
Example<\/h3>\n
fruits[1<\/span>] = \"mango\"<\/span>
\nprint<\/span>(fruits)
\n<\/code><\/div>\n<\/div>\n7. List Length<\/h2>\n
len()<\/code> to find how many items are in the list.<\/p>\nExample<\/h3>\n
print<\/span>(len<\/span>(fruits))
\n<\/code><\/div>\n<\/div>\n8. Adding Items to a List<\/h2>\n
Using
append()<\/code> (Add at end)<\/h3>\nfruits.append(\"grape\"<\/span>)
\nprint<\/span>(fruits)
\n<\/code><\/div>\n<\/div>\nUsing
insert()<\/code> (Add at position)<\/h3>\nfruits.insert(1<\/span>, \"kiwi\"<\/span>)
\nprint<\/span>(fruits)
\n<\/code><\/div>\n<\/div>\n9. Removing Items from a List<\/h2>\n
Using
remove()<\/code><\/h3>\nfruits.remove(\"apple\"<\/span>)
\nprint<\/span>(fruits)
\n<\/code><\/div>\n<\/div>\nUsing
pop()<\/code><\/h3>\nfruits.pop()
\nprint<\/span>(fruits)
\n<\/code><\/div>\n<\/div>\n10. Loop Through a List<\/h2>\n
Example<\/h3>\n
for<\/span> fruit in<\/span> fruits:
\n print<\/span>(fruit)
\n<\/code><\/div>\n<\/div>\n11. Checking Item in List<\/h2>\n
Example<\/h3>\n
print<\/span>(\"banana\"<\/span> in<\/span> fruits)
\n<\/code><\/div>\n<\/div>\n12. Common Beginner Mistakes<\/h2>\n
\u274c Wrong Index<\/h3>\n
print<\/span>(fruits[5<\/span>])
\n<\/code><\/div>\n<\/div>\n\u274c Forgetting Quotes<\/h3>\n
fruits = [apple, banana]
\n<\/code><\/div>\n<\/div>\nfruits = [\"apple\"<\/span>, \"banana\"<\/span>]
\n<\/code><\/div>\n<\/div>\n13. Simple Practice Examples<\/h2>\n
Example 1: Number List<\/h3>\n
numbers = [1<\/span>, 2<\/span>, 3<\/span>, 4<\/span>]
\nprint<\/span>(numbers)
\n<\/code><\/div>\n<\/div>\nExample 2: Sum of List<\/h3>\n
numbers = [10<\/span>, 20<\/span>, 30<\/span>]
\nprint<\/span>(sum<\/span>(numbers))
\n<\/code><\/div>\n<\/div>\nExample 3: Change Item<\/h3>\n
colors = [\"red\"<\/span>, \"blue\"<\/span>, \"green\"<\/span>]
\ncolors[0<\/span>] = \"yellow\"<\/span>
\nprint<\/span>(colors)
\n<\/code><\/div>\n<\/div>\n14. Summary (Python Lists)<\/h2>\n
\u2714 Index starts from 0
\u2714 Lists are changeable
\u2714 Use append(), insert(), remove()
\u2714 Very useful in real programs<\/p>\n\ud83d\udcd8 Perfect for Beginner eBook<\/h3>\n
\n
\n