Python Cheat Sheet

Vocabulary

Variable	Holds a value and can be change
String	a list of characters such as numbers, letters, symbols
Integer number	Whole number/counting number
Float number	Number in decimal
Syntax	Grammar/Structure of language
Boolean	True/False
length	the length of the string

Function

Print()	Show information that you want on screen
Int()	Change number to be number integer
input()	receives info from the user
str()	converts the value to a string
float()	converts the value to a floating point
len()	The length of the string
#	comment,no effect
'''	Multi-line comment

Multiplication and Exponents

string * number	stringsting...(number)
string* string	Fail!!
number * number	Multiply
string ** string	Fail!!
number ** number	Exponent
string ** number	Fail!!

Convert to Binary String

user_number = ' '

while user_name != ' '
user_number = input("Enter a number to convert to binary")
number = int(user_number)
binary_string = ' '

while (number > 0)
remainder = number%2
binary_string = str(remainder)+binary_string
number = number//2

print ("Binary string is", binary_string)

Simple Function

def printdefinitions(word):
    if word == ("variable"):
        print ("""A variable is the value that can change""")
    elif word == ("function"):
        print ("""A function is the blog of code that can be reused""")
    elif word == ("parameter"):
        print ("""A parameter is something given to the function""")
    elif word == ("agrument"):
        print ("""An agrument is something given to the function""")
    elif word == ("string"):
        print ("""A string is a lsit of characters""")
    elif word == ("function call"):
        print ("""A function call makes your function run""")
    else:
        print ("Unknown word")
    return
while True: #keep the loop go forever
    user_input = input("Enter word: ")
    
    printdefinitions(user_input)

Simple Function

def printdefinitions(word):
    if word == ("variable"):
        print ("""A variable is the value that can change""")
    elif word == ("function"):
        print ("""A function is the blog of code that can be reused""")
    elif word == ("parameter"):
        print ("""A parameter is something given to the function""")
    elif word == ("agrument"):
        print ("""An agrument is something given to the function""")
    elif word == ("string"):
        print ("""A string is a lsit of characters""")
    elif word == ("function call"):
        print ("""A function call makes your function run""")
    else:
        print ("Unknown word")
    return
while True: #keep the loop go forever
    user_input = input("Enter word: ")
    
    printdefinitions(user_input)

Enter word: hello
Unknown word
Enter word: function
A function is the blog of code that can be reused
Enter word: variable
A variable is the value that can change
Enter word:
area/volume of

Symbols

==	equal to
!=	not equal to
<	less than
<=	less than or equal to
>	greater than
>=	greater than or equal to
+	add
-	subtract
*	multiply
/	divide and quotient is float
//	divide and quotient is integer
**	exponent
%	modulo: the remainder

Addition

string + string	combine together
string + number	Fail
number + number	plus
number - number	minus

Sample code

mystr = "hellp THERE"

print (mystr.upper()) -all letters will become big HELP THREE
print (mystr.lower()) -all letters will become small help three
print (mystr.capitalize()) -First letter of first word will become big Help three
print (mystr.title())- first letter of each words will become big Help Three

Example

Print (2) – integer
Print (2.5) – floating point
Print (“Hello”) – string
Print (mystr) – variable
Print (mystr,”Hi”,2,1.0) -- commas

mystr = “Hi”
mystr ← name
“Hi” ← value can change

print (int(1.5)) → 1
print (int(“2”)) → 2
print (float(1)) → 1.0 anything to a float

Modulo/Remainder %
print (4%2) → 0
print (30%7) → 2

Area of the circle

def areaOfCircle(r):
pi = 3.1415
area = pir*2
return area
user_radius = float (input("Enter the radius: "))
print ('The area of the circle is',areaOfCircle(user_radius))

MaxValue

def max2(num1,num2):
    maxvalue = num1
    if num2 > maxvalue:
        maxvalue = num2
  
    return maxvalue


print (max2(4,5))
print (max2(33,5))


def max3(num1,num2,num3):
    
    maxvalue = num1

    if num2 > maxvalue:
        maxvalue = num2
    if num3 > maxvalue:
        maxvalue = num3
    
    return maxvalue
print (max3(1,2,3))

5
33
3

Maxlist

def maxlist(list):
    maxvalue = list[0]

    for item in list:
        if item > maxvalue:
            maxvalue = item

    return maxvalue
mylist = [1,2,3,4,55,66,777,0,1]
print(maxlist(mylist))
777

Naming Conventions

Rule for giving name
-letter
-numbers
-underscore_

Valid name
- _myStr
- my3
- Hello_there

Invalid name
- 3my="hi" -- cannot start with number
- first name = "hi"
- first-name
- first+name

Capital letter

name = "tim GIRARD"

print (name.upper()) → TIM GIRARD
print (name.lower()) → tim girard
print (name.capitalize()) → Tim girard
print (name.title()) → Tim Girard

circle area

def areaofcircle(radius):
    if radius <= 0:
        return "Error: invalid raadius"

    pi = 3.1415
    area = pi (radius*2)
    return area

user_radius = float(input("Enter the radius: "))

print('The area of the circle is', areaofcircle(user_radius))

Enter the radius: 2
The area of the circle is 12.566

Enter the radius: 0
The area of the circle is Error: invalid raadius

Countdown Number

user_number = input("Please enter the number")
number = int(user_number)
countdown_string = ""
while number>0:
countdown_string = countdown_string + str(number)
number = number - 1
print (countdown_string)

Palindrome

def isPalindrome(word):
    reverse = ""
    letter_num=0
    while letter_num<len(user_input):
        reverse = user_input[letter_num]+reverse
        letter_num = letter_num+1

    if reverse==word:
        return True
    else:
        return False
    
while True :

    user_input = input("Enter a word")

    if user_input == "quit":
        break
    

    isPal = isPalindrome(user_input)
    
    if isPal == True:
        print (user_input,'is parindorm')
    else:
        print (user_input,'is not parindorm')
        break
Enter a word113311
113311 is parindorm
Enter a word123
123 is not parindorm
Enter a wordquit

Short word per line

mystr = "Hello"

letter_num = 0

while letter_num < len(mystr):
         print (mystr[letter_num])
         letter_num = letter_num + 1


H
e
l
l
o

Basic Function

def myprint(text):
    print ("" + str(text) + "")

    return

myprint("opal")

hello it's bacon
opal

def myprintnew(text, decoration):
    print (decoration + str(text) + decoration)
    return
myprintnew("opal", "m")

hello it's bacon
opal
mopalm

def doubleit(number):
    return number * 2

print (doubleit(3))
print (doubleit(doubleit(4)))


hello it's bacon
opal
mopalm
6

Python Cheat Sheet by Gameniti

Vocabulary

Function

Multiplication and Exponents

Convert to Binary String

Simple Function

Simple Function

Symbols

Addition

Sample code

Example

Area of the circle

MaxValue

Maxlist

Naming Conventions

Capital letter

circle area

Countdown Number

Palindrome

Short word per line

Basic Function

Created By

Metadata

Comments

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Python Cheat Sheet by Gameniti

Vocabulary

Function

Multip­­­­­­­l­­i­­­c­­­­ation and Exponents

Convert to Binary String

Simple Function

Simple Function

Symbols

Addition

Sample code

Example

Area of the circle

MaxValue

Maxlist

Naming Conven­­­tions

Capital letter

circle area

Countdown Number

Palindrome

Short word per line

Basic Function

Created By

Metadata

Comments

Add a Comment

Latest Cheat Sheet

Random Cheat Sheet

About Cheatography

Behind the Scenes

Recent Activity

Multiplication and Exponents

Naming Conventions