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python Cheat Sheet by

Addition

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

Functions

print()
displays inform­ation on the screen
float()
change number to be decimal number
int()
change number to number integer
int()
gain inform­ation
str()
a list of number­,letter and symbols

Code

name = " Natnicha Wangchinda "
print (name.upper())
print (name.lower())
print (name.capitalize())
print (name.title())

Counts down

#create a program that recieves a number from the user and count down from that number on the same line
#recieve the number from the user as a string
user_number = input ("enter number")
#convert the user number to an integer
number = int(user_number)
#setupthe countdown string
countdown_string = ""
while number > 0:
    #add the number to the string
    #subtract 1 from the number

code

#write a program the converts a number to binary

#get a number from the user
user_number = input("Please enter a number: ")

#convert to integer
number = int(user_number)

binary_string = ''
while (number > 0):#the numbrer is grater than 0)
    remainder = number % 2
    binary_string = str(remainder) + binary_string
    number = number // 2
    print(number)
    #print (number)




#after the loop print the binary string
print ("Binary string is", binary_string)


#expected output - 5 = 101
#expected output - 3 = 11
#expected output - 2 = 10
 

Multip­lic­ation and Exponents

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

code

while True:


    user_radius = input("What is the radius?")
    radius = float(user_radius)
    pi = 3.1415
    area = pi radius * 2
    print ("The area of the cirle is", area)

code

mystring = "hello"
print (mystring)
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 letternumer >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 )

code

def createList(quitword):
    mylist = []
    while True :
        item = input("Please enter a list item: ")

        if (item == quitword) :
            return (mylist)
        duplicateword = False

        for myvar in mylist:
            if myvar == item:
                duplicateword = True

        if duplicateword == True :
            print('Duplicate word!')
        else:
            mylist.append (item)

mylist = createList("stop")
print (mylist)
 

Vocabulary

Variable
hold a value and can be change
string
a list of character such as number­,le­tter, and symbols
integer number
whole number or counting number
float number
the number in decimal
syntax
gramma or structure of language
value
the number os string can be store in valuable
module
the text for storing for python code
input
gain inform­ation
print
to show inform­ation on the screen
syntax error
make impossible to the parse error

code

# 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)

Math

+
plus
-
minus
*
multiple
/
divide
%
remainder (4%2)-> 0
**
exponent 2**3->2^3
==
equal to
!=
no equal to
<
less than
>
more than
<=
less than or equal to
>=
more than or equal to

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