Contents

• Python Tokens
• Variables and Assignments
• Simple Input/Output
• Data Types
• Mutable and Immutable Types
• Expressions
• If conditions
• Loops
• More Loops Lol

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Python Tokens

The smallest unit in a program

Different Types of Tokens

• keyword
• Identifiers
• Literals
• Operators
• Punctuators

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Keywords

Predefined words which has special meaning to the python interpreter. you can't use this to name your variables

Example Keywords

• False
• True
• None
• import
• pass
• break

there are more, but I am lazy to type it all :)

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Identifiers

The names given by you is an identifier! example? the name of the variables and name of the functions.. there are more.. but I am lazy :)

Thou shalt follow the rules

• Variables should be non keyword with no space in between

# Invalid Variable
pass variable = "Hello"

# Valid Variable
variable = "World"

• made only with Letters, Numbers and Underscore (_)

# Invalid Variable
var-3 = "Hello"

# Valid Variable
var3 = "World"

• variables cannot start with a number, but can contain numbers

# Invalid Variable
3var = "Hello"

# Valid Variable
var3 = "World"

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Literals

Data items which has fixed/constant value.

String Literals

String, just imagine that its a word.

• Single line Strings

  var = "This is a string"
  var1 = 'String with single quotes'
  

• Multiline Strings

  var = '''
         hello
         I am a multi line
         string
      '''
  

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Numeric Literals

numeric literals? they are just numbers..

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Integers

int they are just integers. 0, positive and negative numbers

Types

• Decimal - Base 10
• Octal - Base 8
• Hexadecimal - Base 16

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Float

float they are numbers with decimal points 3.14159,10.32, etc

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Boolean Literals

its just True and False nothing much tosay to be honest

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None

None. its just none. if you asked something to python and python cannot find it, it returns None

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Data Types

Lists

A group of comma seperated values of any datatypes between square brackets

lis = [1,2,3,4,5,6,7,8,9]
lis1 = ['q','w','e']
lis2 = [1,2,3,4,'1']

Tuples

A group of comma seperated values of any datatypes within parentheses.

tup = (1,2,3,4,5)
tup1 = ('q','w','e')
tup2 = (1,2,3,'e')

Sets

Mutable datatype like list but you can't have duplicates in it.

# Invalid Set
set1 = {1,1,3,4}

# Valid Set
set2 = {1,2,3,4}

Dictionaries

an unordered set of comma seperated key:value pairs within {}

dicto = {'a':1 ,'e':2 ,'i':3 ,'o':4}

If conditions

Plain If condition

var = True

if var:
    print("Var is True")

You can also write it as.

var = True

if var == True:
    print("var is True")

If-else statements

var = True

if var == True:
    print("Var is true")

else:
    print("var is false")

If-elif statements

var = "Hello"

if var == "Hello":
    print("its hello")

elif var == "ok":
    print("hi")

else:
    print("hmm")