{"id":389,"date":"2026-03-08T10:49:05","date_gmt":"2026-03-08T10:49:05","guid":{"rendered":"https:\/\/codetypingpro.com\/?p=389"},"modified":"2026-03-08T10:49:05","modified_gmt":"2026-03-08T10:49:05","slug":"%f0%9f%93%98-lesson-10-dictionaries-in-python","status":"publish","type":"post","link":"https:\/\/codetypingpro.com\/?p=389","title":{"rendered":"\ud83d\udcd8 Lesson 10: Dictionaries in Python"},"content":{"rendered":"\n

Python<\/h1>\n\n\n\n
\n\n\n\n

\ud83d\udd39 1. What is a Dictionary?<\/h1>\n\n\n\n

A dictionary<\/strong> is a collection of key\u2013value pairs<\/strong>.<\/p>\n\n\n\n

Example structure:<\/p>\n\n\n\n

key : value<\/pre>\n\n\n\n
Example:<\/p>\n\n\n\n
name : Sameer
age : 25
city : Hyderabad<\/pre>\n\n\n\n
In Python dictionaries are written using curly brackets {}<\/code><\/strong>.<\/p>\n\n\n\n
\u2714 Stores data as key : value<\/strong>
\u2714 Ordered (Python 3.7+)
\u2714 Changeable (mutable)
\u2714 No duplicate keys<\/p>\n\n\n\n
\n\n\n\n
\ud83d\udd39 2. Creating a Dictionary<\/h1>\n\n\n\n
Example 1<\/h3>\n\n\n\n
student = {
    \"name\": \"Sameer\",
    \"age\": 22,
    \"city\": \"Hyderabad\"
}print(student)<\/pre>\n\n\n\n
Output<\/strong><\/p>\n\n\n\n
{'name': 'Sameer', 'age': 22, 'city': 'Hyderabad'}<\/pre>\n\n\n\n
\ud83d\udccc Explanation<\/p>\n\n\n\n
    \n
  • \"name\"<\/code>, \"age\"<\/code>, \"city\"<\/code> \u2192 keys<\/li>\n\n\n\n
  • \"Sameer\"<\/code>, 22<\/code>, \"Hyderabad\"<\/code> \u2192 values<\/li>\n<\/ul>\n\n\n\n
    \n\n\n\n
    \ud83d\udd39 3. Accessing Dictionary Values<\/h1>\n\n\n\n
    Use the key name<\/strong> to access values.<\/p>\n\n\n\n
    Example 2<\/h3>\n\n\n\n
    student = {
        \"name\": \"Ayesha\",
        \"age\": 21,
        \"city\": \"Warangal\"
    }print(student[\"name\"])
    print(student[\"age\"])<\/pre>\n\n\n\n
    Output<\/strong><\/p>\n\n\n\n
    Ayesha
    21<\/pre>\n\n\n\n
    \ud83d\udccc Explanation
    The value is retrieved using the key.<\/p>\n\n\n\n
    \n\n\n\n
    \ud83d\udd39 4. Changing Dictionary Values<\/h1>\n\n\n\n
    Example 3<\/h3>\n\n\n\n
    student = {
        \"name\": \"Saddam\",
        \"age\": 24
    }student[\"age\"] = 25print(student)<\/pre>\n\n\n\n
    Output<\/strong><\/p>\n\n\n\n
    {'name': 'Saddam', 'age': 25}<\/pre>\n\n\n\n
    \ud83d\udccc Explanation
    Dictionaries are mutable<\/strong>, so values can be updated.<\/p>\n\n\n\n
    \n\n\n\n
    \ud83d\udd39 5. Adding New Key\u2013Value Pairs<\/h1>\n\n\n\n
    Example 4<\/h3>\n\n\n\n
    student = {
        \"name\": \"Chandini\",
        \"age\": 23
    }student[\"city\"] = \"Hyderabad\"print(student)<\/pre>\n\n\n\n
    Output<\/strong><\/p>\n\n\n\n
    {'name': 'Chandini', 'age': 23, 'city': 'Hyderabad'}<\/pre>\n\n\n\n
    \n\n\n\n
    \ud83d\udd39 6. Removing Items from Dictionary<\/h1>\n\n\n\n
    Example 5<\/h3>\n\n\n\n
    student = {
        \"name\": \"Gousya\",
        \"age\": 22,
        \"city\": \"Warangal\"
    }student.pop(\"city\")print(student)<\/pre>\n\n\n\n
    Output<\/strong><\/p>\n\n\n\n
    {'name': 'Gousya', 'age': 22}<\/pre>\n\n\n\n
    \ud83d\udccc Explanation
    pop()<\/code> removes a key-value pair.<\/p>\n\n\n\n
    \n\n\n\n
    \ud83d\udd39 7. Dictionary Length<\/h1>\n\n\n\n
    Example 6<\/h3>\n\n\n\n
    student = {
        \"name\": \"Sameer\",
        \"age\": 22,
        \"city\": \"Hyderabad\"
    }print(len(student))<\/pre>\n\n\n\n
    Output<\/strong><\/p>\n\n\n\n
    3<\/pre>\n\n\n\n
    \ud83d\udccc Explanation
    len()<\/code> counts the number of keys.<\/p>\n\n\n\n
    \n\n\n\n
    \ud83d\udd39 8. Loop Through Dictionary<\/h1>\n\n\n\n
    \n\n\n\n
    Example 7: Loop Through Keys<\/h3>\n\n\n\n
    student = {
        \"name\": \"Sameer\",
        \"age\": 22,
        \"city\": \"Hyderabad\"
    }for key in student:
        print(key)<\/pre>\n\n\n\n
    Output<\/strong><\/p>\n\n\n\n
    name
    age
    city<\/pre>\n\n\n\n
    \n\n\n\n
    Example 8: Loop Through Values<\/h3>\n\n\n\n
    student = {
        \"name\": \"Ayesha\",
        \"age\": 21,
        \"city\": \"Warangal\"
    }for value in student.values():
        print(value)<\/pre>\n\n\n\n
    Output<\/strong><\/p>\n\n\n\n
    Ayesha
    21
    Warangal<\/pre>\n\n\n\n
    \n\n\n\n
    Example 9: Loop Through Key\u2013Value Pairs<\/h3>\n\n\n\n
    student = {
        \"name\": \"Saddam\",
        \"age\": 24,
        \"city\": \"Hyderabad\"
    }for key, value in student.items():
        print(key, \":\", value)<\/pre>\n\n\n\n
    Output<\/strong><\/p>\n\n\n\n
    name : Saddam
    age : 24
    city : Hyderabad<\/pre>\n\n\n\n
    \n\n\n\n
    \ud83d\udd39 9. Checking if Key Exists<\/h1>\n\n\n\n
    Example 10<\/h3>\n\n\n\n
    student = {
        \"name\": \"Sameer\",
        \"age\": 22
    }print(\"name\" in student)
    print(\"city\" in student)<\/pre>\n\n\n\n
    Output<\/strong><\/p>\n\n\n\n
    True
    False<\/pre>\n\n\n\n
    \ud83d\udccc Explanation
    Checks if a key exists in dictionary.<\/p>\n\n\n\n
    \n\n\n\n
    \ud83d\udd39 10. Nested Dictionary<\/h1>\n\n\n\n
    A dictionary inside another dictionary.<\/p>\n\n\n\n
    \n\n\n\n
    Example 11<\/h3>\n\n\n\n
    students = {
        \"student1\": {
            \"name\": \"Sameer\",
            \"age\": 22
        },
        \"student2\": {
            \"name\": \"Ayesha\",
            \"age\": 21
        }
    }print(students[\"student1\"][\"name\"])<\/pre>\n\n\n\n
    Output<\/strong><\/p>\n\n\n\n
    Sameer<\/pre>\n\n\n\n
    \n\n\n\n
    \ud83d\udd39 11. Real-Life Example<\/h1>\n\n\n\n
    Employee Information<\/h3>\n\n\n\n
    employee = {
        \"name\": \"Gousya\",
        \"salary\": 30000,
        \"department\": \"IT\"
    }print(\"Employee Name:\", employee[\"name\"])
    print(\"Salary:\", employee[\"salary\"])
    print(\"Department:\", employee[\"department\"])<\/pre>\n\n\n\n
    Output<\/strong><\/p>\n\n\n\n
    Employee Name: Gousya
    Salary: 30000
    Department: IT<\/pre>\n\n\n\n
    \n\n\n\n
    \ud83d\udd39 12. Common Dictionary Methods<\/h1>\n\n\n\n
    Method<\/th>Purpose<\/th><\/tr><\/thead>
    keys()<\/code><\/td>Returns keys<\/td><\/tr>
    values()<\/code><\/td>Returns values<\/td><\/tr>
    items()<\/code><\/td>Returns key-value pairs<\/td><\/tr>
    pop()<\/code><\/td>Removes item<\/td><\/tr>
    update()<\/code><\/td>Updates dictionary<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"
    Python \ud83d\udd39 1. What is a Dictionary? A dictionary is a collection of key\u2013value pairs. Example structure: key : value Example: name : Sameerage : 25city : Hyderabad In Python dictionaries are written using curly brackets {}. \u2714 Stores data as key : value\u2714 Ordered (Python 3.7+)\u2714 Changeable (mutable)\u2714 No duplicate keys \ud83d\udd39 2. Creating […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-389","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/codetypingpro.com\/index.php?rest_route=\/wp\/v2\/posts\/389","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/codetypingpro.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/codetypingpro.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/codetypingpro.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/codetypingpro.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=389"}],"version-history":[{"count":1,"href":"https:\/\/codetypingpro.com\/index.php?rest_route=\/wp\/v2\/posts\/389\/revisions"}],"predecessor-version":[{"id":390,"href":"https:\/\/codetypingpro.com\/index.php?rest_route=\/wp\/v2\/posts\/389\/revisions\/390"}],"wp:attachment":[{"href":"https:\/\/codetypingpro.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=389"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/codetypingpro.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=389"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/codetypingpro.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=389"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}