Update Assigment.md

first_class_19_apr/Assigment.md

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 # Assigments:
 - Research and list the rules for naming variables in Python.
+- Answer: 1.	Start with a letter or underscore: Variable names must begin with a letter (A-Z, a-z) or an underscore (_), but not a number.
+2.	No spaces: Variable names cannot contain spaces. Use underscores (_) to separate words if needed.
+3.	Only alphanumeric characters and underscores: Variable names can include letters, numbers (0-9), and underscores (_), but no special characters like @, $, or %.
+4.	Case-sensitive: Python treats uppercase and lowercase letters as different variables. For example, name, Name, and NAME are three distinct variables.
+5.	Cannot be a Python keyword: You cannot use reserved words like class, def, return, or import as variable names.
+6.	Use meaningful names: While not a strict rule, it's best practice to use descriptive names like student_id instead of sid or x.
+7.	Follow naming conventions:
+o	Camel Case: myVariableName
+o	Pascal Case: MyVariableName
+o	Snake Case: my_variable_name
 - Explore the precedence of arithmetic operators in Python.
+- Answer: 1.	Parentheses () – Highest precedence; operations inside parentheses are evaluated first.
+2.	Exponentiation ** – Right-to-left associativity (e.g., 2 ** 3 ** 2 evaluates as 2 ** (3 ** 2)).
+3.	Unary operators +x, -x, ~x – Unary plus, minus, and bitwise NOT.
+4.	Multiplication, Division, Floor Division, Modulus *, /, //, % – Left-to-right associativity.
+5.	Addition and Subtraction +, - – Left-to-right associativity.
+6.	Bitwise Shift Operators <<, >> – Left-to-right associativity.
+7.	Bitwise AND & – Left-to-right associativity.
+8.	Bitwise XOR ^ – Left-to-right associativity.
+9.	Bitwise OR | – Left-to-right associativity.
 - Explore all string methods in Python.
-
+- Answer: String Modification Methods
+•	capitalize() – Converts the first character to uppercase.
+•	lower() – Converts all characters to lowercase.
+•	upper() – Converts all characters to uppercase.
+•	title() – Converts the first character of each word to uppercase.
+•	swapcase() – Swaps uppercase and lowercase characters.
+String Checking Methods
+•	isalnum() – Returns True if all characters are alphanumeric.
+•	isalpha() – Returns True if all characters are alphabetic.
+•	isdigit() – Returns True if all characters are digits.
+•	isspace() – Returns True if all characters are whitespace.
+•	isupper() – Returns True if all characters are uppercase.
+•	islower() – Returns True if all characters are lowercase.
+String Searching Methods
+•	find(substring) – Returns the index of the first occurrence of substring, or -1 if not found.
+•	index(substring) – Similar to find(), but raises an error if substring is not found.
+•	count(substring) – Returns the number of occurrences of substring.
+•	startswith(prefix) – Returns True if the string starts with prefix.
+•	endswith(suffix) – Returns True if the string ends with suffix.
+String Modification & Formatting
+•	replace(old, new) – Replaces occurrences of old with new.
+•	strip() – Removes leading and trailing whitespace.
+•	lstrip() – Removes leading whitespace.
+•	rstrip() – Removes trailing whitespace.
+•	split(separator) – Splits the string into a list based on separator.
+•	join(iterable) – Joins elements of an iterable into a string.
+String Alignment Methods
+•	center(width) – Centers the string within a given width.
+•	ljust(width) – Left-aligns the string within a given width.
+•	rjust(width) – Right-aligns the string within a given width.
+String Encoding & Translation
+•	encode(encoding) – Encodes the string using the specified encoding.
+•	translate(mapping) – Translates characters using a mapping table.
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