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

Help Us Go Positive!

Created By

Metadata

Comments

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Recent Activity

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

How's Your Readability?

Help Us Go Positive!

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