{"id":60,"date":"2025-10-21T04:20:14","date_gmt":"2025-10-21T04:20:14","guid":{"rendered":"https:\/\/codetypingpro.com\/?p=60"},"modified":"2025-12-17T07:50:26","modified_gmt":"2025-12-17T07:50:26","slug":"lesson-8-strings-and-string-methods","status":"publish","type":"post","link":"https:\/\/codetypingpro.com\/?p=60","title":{"rendered":"Lesson 8: Strings and String Methods"},"content":{"rendered":"\n

\ud83c\udfaf Lesson Objective<\/strong><\/h3>\n\n\n\n

To understand how to work with text data in Python, perform string operations, and use built-in string methods for manipulation and analysis.<\/p>\n\n\n\n

\n\n\n\n

\ud83e\udde0 1. What Is a String?<\/strong><\/h3>\n\n\n\n

A string<\/strong> is a sequence of characters enclosed in single quotes (”)<\/strong>, double quotes (“”)<\/strong>, or triple quotes (”’ ”’)<\/strong>.<\/p>\n\n\n\n

\u2705 Example:<\/strong><\/p>\n\n\n\n

name = \"Sameer\"\ngreeting = 'Hello!'\nmessage = '''Welcome to Python programming.'''\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
\u2699\ufe0f 2. Accessing String Characters<\/strong><\/h3>\n\n\n\n
Strings are indexed<\/strong>, meaning each character has a position (starting from 0).<\/p>\n\n\n\n
text = \"Python\"\nprint(text[0])   # First character\nprint(text[5])   # Last character\n<\/code><\/pre>\n\n\n\n
Output:<\/strong><\/p>\n\n\n\n
P\nn\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
\ud83d\udd04 3. String Slicing<\/strong><\/h3>\n\n\n\n
You can extract parts of a string using slicing.<\/p>\n\n\n\n
word = \"Programming\"\nprint(word[0:6])     # Output: Progra\nprint(word[3:])      # Output: gramming\nprint(word[:5])      # Output: Progr\nprint(word[-3:])     # Output: ing\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
\ud83e\udde9 4. String Concatenation and Repetition<\/strong><\/h3>\n\n\n\n
You can join strings<\/strong> using +<\/code> and repeat<\/strong> using *<\/code>.<\/p>\n\n\n\n
a = \"Hello\"\nb = \"Python\"\nprint(a + \" \" + b)   # Concatenation\nprint(a * 3)         # Repetition\n<\/code><\/pre>\n\n\n\n
Output:<\/strong><\/p>\n\n\n\n
Hello Python\nHelloHelloHello\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
\ud83d\udd22 5. String Length<\/strong><\/h3>\n\n\n\n
Find the number of characters using len()<\/code>.<\/p>\n\n\n\n
text = \"Python\"\nprint(len(text))\n<\/code><\/pre>\n\n\n\n
Output:<\/strong><\/p>\n\n\n\n
6\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
\u2702\ufe0f 6. Checking for Substrings<\/strong><\/h3>\n\n\n\n
You can check if a substring exists using the in<\/code> or not in<\/code> operator.<\/p>\n\n\n\n
text = \"Learning Python\"\nprint(\"Python\" in text)\nprint(\"Java\" not in text)\n<\/code><\/pre>\n\n\n\n
Output:<\/strong><\/p>\n\n\n\n
True\nTrue\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
\ud83e\uddf0 7. Common String Methods<\/strong><\/h3>\n\n\n\n
Method<\/th>Description<\/th>Example<\/th><\/tr><\/thead>
upper()<\/code><\/td>Converts all characters to uppercase<\/td>\"hello\".upper()<\/code> \u2192 HELLO<\/code><\/td><\/tr>
lower()<\/code><\/td>Converts all characters to lowercase<\/td>\"HELLO\".lower()<\/code> \u2192 hello<\/code><\/td><\/tr>
title()<\/code><\/td>Capitalizes first letter of each word<\/td>\"hello world\".title()<\/code> \u2192 Hello World<\/code><\/td><\/tr>
strip()<\/code><\/td>Removes spaces from start and end<\/td>\" hello \".strip()<\/code> \u2192 hello<\/code><\/td><\/tr>
replace()<\/code><\/td>Replaces substring<\/td>\"I love Java\".replace(\"Java\", \"Python\")<\/code> \u2192 I love Python<\/code><\/td><\/tr>
split()<\/code><\/td>Splits string into list<\/td>\"a,b,c\".split(\",\")<\/code> \u2192 ['a', 'b', 'c']<\/code><\/td><\/tr>
join()<\/code><\/td>Joins list into a string<\/td>\"-\".join(['a','b','c'])<\/code> \u2192 a-b-c<\/code><\/td><\/tr>
find()<\/code><\/td>Returns index of substring<\/td>\"python\".find(\"th\")<\/code> \u2192 2<\/code><\/td><\/tr>
count()<\/code><\/td>Counts occurrences<\/td>\"apple\".count(\"p\")<\/code> \u2192 2<\/code><\/td><\/tr>
startswith()<\/code> \/ endswith()<\/code><\/td>Checks prefix\/suffix<\/td>\"Python\".startswith(\"Py\")<\/code> \u2192 True<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\n
\ud83d\udd24 8. Escape Characters<\/strong><\/h3>\n\n\n\n
Used to include special characters inside strings.<\/p>\n\n\n\n
Escape Code<\/th>Meaning<\/th>Example<\/th><\/tr><\/thead>
\\'<\/code><\/td>Single quote<\/td>'It\\'s fun'<\/code><\/td><\/tr>
\\\"<\/code><\/td>Double quote<\/td>\"He said \\\"Hi\\\"\"<\/code><\/td><\/tr>
\\\\<\/code><\/td>Backslash<\/td>\"C:\\\\Users\"<\/code><\/td><\/tr>
\\n<\/code><\/td>New line<\/td>\"Hello\\nWorld\"<\/code><\/td><\/tr>
\\t<\/code><\/td>Tab space<\/td>\"Hello\\tWorld\"<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\u2705 Example:<\/strong><\/p>\n\n\n\n
print(\"Name:\\tSameer\\nCity:\\tWarangal\")\n<\/code><\/pre>\n\n\n\n
Output:<\/strong><\/p>\n\n\n\n
Name:   Sameer\nCity:   Warangal\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
\ud83e\uddee 9. String Formatting<\/strong><\/h3>\n\n\n\n
You can use f-strings<\/strong> or format()<\/code> for neat output.<\/p>\n\n\n\n
name = \"Sameer\"\nage = 25\nprint(f\"My name is {name} and I am {age} years old.\")\n<\/code><\/pre>\n\n\n\n
Output:<\/strong><\/p>\n\n\n\n
My name is Sameer and I am 25 years old.\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
\ud83c\udf0d 10. Real-Life Example: Text Analyzer<\/strong><\/h3>\n\n\n\n
text = input(\"Enter a sentence: \")\nprint(\"Total characters:\", len(text))\nprint(\"Uppercase:\", text.upper())\nprint(\"Number of spaces:\", text.count(\" \"))\nprint(\"Reversed:\", text[::-1])\n<\/code><\/pre>\n\n\n\n
Output (for input \u201cPython is fun\u201d):<\/strong><\/p>\n\n\n\n
Total characters: 13\nUppercase: PYTHON IS FUN\nNumber of spaces: 2\nReversed: nuf si nohtyP\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\ud83c\udfaf Lesson Objective To understand how to work with text data in Python, perform string operations, and use built-in string methods for manipulation and analysis. \ud83e\udde0 1. What Is a String? A string is a sequence of characters enclosed in single quotes (”), double quotes (“”), or triple quotes (”’ ”’). \u2705 Example: \u2699\ufe0f 2. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,1],"tags":[],"class_list":["post-60","post","type-post","status-publish","format-standard","hentry","category-python-easy-course-outline","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/codetypingpro.com\/index.php?rest_route=\/wp\/v2\/posts\/60","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=60"}],"version-history":[{"count":1,"href":"https:\/\/codetypingpro.com\/index.php?rest_route=\/wp\/v2\/posts\/60\/revisions"}],"predecessor-version":[{"id":61,"href":"https:\/\/codetypingpro.com\/index.php?rest_route=\/wp\/v2\/posts\/60\/revisions\/61"}],"wp:attachment":[{"href":"https:\/\/codetypingpro.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=60"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/codetypingpro.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=60"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/codetypingpro.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=60"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}