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Python Cheat Sheet Cheat Sheet by

Math

+
plus
-
minus
*
multiple
/
divide
%
remainder (4%2)-> 0
**
exponent 2**3 -> 2^3
==
equal to
!=
not equal to
<
less than
>
more than
<=
less than or equal to
>=
more than or equal to

Addition

string + string
combine together
string + number
crash
number + number
math - addition

Functions

print ()
displays inform­ation on the screen
input ()
receives inform­ation from the user
int ()
converts a value to an integer
str ()
string ("wo­rd") can be everything
float ()
change number to be decimal number
#
commen­t(one line)
" " " .......... " " "
commen­t(many lines)
import random + random.ch­oice()
pick random item in the list

Code2

shoppinglist = ('tshirt', 'pants', 'socks')
 for myvariable in shoppinglist:
     print (myvariable)


print (shoppinglist(1))

for number in range(5):
    print (number)
 

Name

firstname = input (" What is your first name? ")
lastname = input (" What is your last name? ")
fullname = ( firstname + " " + lastname )
print (fullname)
letternumber = int(input( " What is letter number? " ))
if letternumber > len(fullname):
    print ( " invalid letter number, try again! " )
else:
    letter = (fullname[letternumber])
    print (letter)
    numberletter = int(input(" How many times to print letter? "))
    if numberletter > 100:
        print (" Too many letters to print! " )
        else:
            print ( letter * numberletter )

Vocabulary

Variable
holds a value and can be changed
String
a list of charac­ter­istics such as numbers, letter, symbols
Syntax
Grammar
Modulo
Remainder %
Integer
Real number
Floating Point
Decimals
Boolean
True/False
== equal
!= not equal
Syntax Error
make impossible to the parse

Code1

# Create a program that recieve a number from the user
# from that number on the same line

#recieve the number from the user as a string
user_number = input

#convert the user number to an integer
number = int(user_number)

#setup the countdown string
countdown_string = ""

while number > ():#the number is greater than 0)
    remainder =
    print (number)
    #binary_string =

#output should look like this
# if the user enters 5:
# 5 4 3 2 1
print (countdown_string)
 

Code

mystring = "­hel­lo"
print (mystring)
firstname = input ("What is your firstn­ame­?")
lastname = input ("What is your lastna­me"?)
fullname = firstname + " " + lastname
print(­ful­lname)
letter­number = int(in­put­("What is letter number? " ) )
if lettername > len(fu­lln­ame):
print ("in­valid letter number, try again! " )
else:
letter = (fulln­ame­(le­tte­rnu­mber) )
print (letter)
number­letter = int(input ( "How many times to print letter " ) )

Binary

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) + str(binary_string)
       number = number // 2
print ("Binary string is '', binary_string)

Area of Circle

while 2==2:
    #Ask the user for a radius of a circle
    user_radius = input("What is the radius? ")

    #Convert the given radius to a floating point
    radius = float(user_radius)

    #make a variable called pi
    pi = 3.1415

    #Calculate the area of the circle using exponents
    area = pi radius * 2

    #display the area of the circle to the user
    print ("The area of the circle is",area)

Multip­lic­ation and Exponents

string * number
combine that string
string * string
crash
number * number
math - multiply
string ** string
crash
number ** number
math-e­xponent
string ** number
crash

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