Cheat Sheet: Python Basics

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Package/MethodDescriptionCode Example
CommentsComments are lines of text that are ignored by the Python interpreter when executing the code<./td>
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  1. # This is a comment
ConcatenationCombines (concatenates) strings.Syntax:
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  1. concatenated_string = string1 + string2

Example:

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  1. result = "Hello" + " John"</td>
Data Types- Integer - Float - Boolean - StringExample:
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  1. x=7 
  2. # Integer Value 
  3. y=12.4 
  4. # Float Value 
  5. is_valid = True 
  6. # Boolean Value 
  7. is_valid = False 
  8. # Boolean Value 
  9. F_Name = "John" 
  10. # String Value
IndexingAccesses character at a specific index.Example:
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  1. my_string="Hello" 
  2. char = my_string[0]
len()Returns the length of a string.Syntax:
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  1. len(string_name)

Example:

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  1. my_string="Hello" 
  2. length = len(my_string)
lower()Converts string to lowercase.Example:
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  1. my_string="Hello" 
  2. uppercase_text = my_string.lower()
print()Prints the message or variable inside `()`.Example:
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  1. print("Hello, world") 
  2. print(a+b)
Python Operators- Addition (+): Adds two values together.
- Subtraction (-): Subtracts one value from another.
- Multiplication (*): Multiplies two values.
- Division (/): Divides one value by another, returns a float.
- Floor Division (//): Divides one value by another, returns the quotient as an integer.
- Modulo (%): Returns the remainder after division.		Example:
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  1. x = 9 y = 4 
  2. result_add= x + y # Addition 
  3. result_sub= x - y # Subtraction 
  4. result_mul= x * y # Multiplication 
  5. result_div= x / y # Division 
  6. result_fdiv= x // y # Floor Division 
  7. result_mod= x % y # Modulo</td>
replace()Replaces substrings.Example:
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  1. my_string="Hello" 
  2. new_text = my_string.replace("Hello", "Hi")
SlicingExtracts a portion of the string.Syntax:
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  1. substring = string_name[start:end]

Example:

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  1. my_string="Hello" substring = my_string[0:5]
split()Splits string into a list based on a delimiter.Example:
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  1. my_string="Hello" 
  2. split_text = my_string.split(",")
strip()Removes leading/trailing whitespace.Example:
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  1. my_string="Hello" 
  2. trimmed = my_string.strip()
upper()Converts string to uppercase.Example:
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  1. my_string="Hello" 
  2. uppercase_text = my_string.upper()
Variable AssignmentAssigns a value to a variable.Syntax:
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  1. variable_name = value

Example:

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  1. name="John" # assigning John to variable name 
  2. x = 5 # assigning 5 to variable x

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