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Cheatography

Functions

print()
displays inform­ation on the screen.
input()
receives inform­ation from the user.
int()
converts a value to an integer.
float()
change number to be decimal number.
str()
a list of number­,letter and symbols.
len()
the length of the string.
#
Comment or no effect
long (long integers )
Also called longs, they are integers of unlimited size, written like integers and followed by an uppercase or lowercase L.
complex (complex numbers)
are of the form a + bJ, where a and b are floats and J (or j) represents the square root of -1 (which is an imaginary number). The real part of the number is a, and the imaginary part is b. Complex numbers are not used much in Python progra­mming.

Code

 
name = "noey RAWIDA­"
print (name.u­pp­er())
print (name.l­ow­er())
print (name.c­ap­ita­lize())
print (name.t­it­le())

Condit­ional

if
A statement that the writer given a condition
else
A statement that can be combined with an if statement.
elif
A statement that allows you to check multiple expres­sions for TRUE and execute a block of code as soon as one of the conditions evaluates to TRUE.
while
A statement that acting resembles like a loop.

Number to Binary 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 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 )

Number to Binary 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 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 )

Random Code

import random

mylist = ['Dog','Fish', 'Cat', 'Bear']

counter = 0

while counter < 10:
      random_item = random.choice (mylist)
      print (random_item)
      counter = counter + 1

Python Identifier

Definition
is a name used to identify a variable, function, class, module or other object. An identifier starts with a letter A to Z or a to z or an underscore (_) followed by zero or more letters, unders­cores and digits (0 to 9).

Python Assignment Operators

Operator
Descri­ption
**E

Python Assignment Operators

 
Operator
Descri­ption
Example
=
Assigns values from right side operands to left side operand
c = a + b assigns value of a + b into c
+=Add AND
It adds right operand to the left operand and assign the result to left operand
c += a is equivalent to c = c + a
-=Subtract AND
It subtracts right operand from the left operand and assign the result to left operand
c -= a is equivalent to c = c - a
*=Multiply AND
It multiplies right operand with the left operand and assign the result to left operand
c = a is equivalent to c = c a
/=Divide AND
It divides left operand with the right operand and assign the result to left operand
c /= a is equivalent to c = c / ac /= a is equivalent to c = c / a
%=Modulus AND
It takes modulus using two operands and assign the result to left operand
c %= a is equivalent to c = c % a
**=Exp­onent AND
Performs expone­ntial (power) calcul­ation on operators and assign value to the left operand
c = a is equivalent to c = c a
//=Floor Division
It performs floor division on operators and assign value to the left operand
c //= a is equivalent to c = c // a
 

Addition

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

Multip­­li­c­ation and Exponents

string * number
combine that string multiple times.
string * string
crash
number * number
math - multiply
string ** string
crash
number ** number
math - exponents
string ** number
crash

Data Types

Integer
-256, 15
Float
-253.23, 1.253e-10
String
" Hel lo", 'Goodbye', " " " Mul til ine " " "
Boolean
True,False
List
[ value, ... ]
Tuple
( value, ... )1
Dictionary
{ key: value, ... }
Set
{ value, value, ... }2

Loop list Code

def creatlist(quitword) :
    print ('Keep entering words to add to the list')
    print ('Quit when word =', quitword)

    mylist = []

    while True:
        user_word = input('Enter a word to add to the list:')

        if user_word == quitword
            return mylist
        duplicateword = False

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

        for item == user_word:
                duplicateword = True

        if duplicateword == True:
            print ('Duplicate Word')
        else:
            mylist.append(user_word)

userlist = createList("stop")
print(userlist)

Random Choice Code

import random
mylist = ['beagle','pomeranian','pug','golden','chihuahua']
score = 0
chances = 3
start_over = 0
random_item = random.choice(mylist)

while chances > 0:
    start_over = 0
    random_item = random.choice(mylist)
    
    while start_over < 1:
        print ("-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-")
        print ("Guessing Game")
        print ("-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-")
        print("words:", mylist)
        guess = input("Guess a word: ")

        if (guess in mylist):
            
            if(guess == random_item ):
                print("That's correct!")
                score = score + 100
                print("Score:", score)
                start_over = 2
            else:
                print("Sorry, wrong choice! ")
                chances = int(chances) -1 
        else:
            print("Sorry, that is not even in the list")
            chances = int(chances) -1

        if(chances > 0):
            print("Chances remaining:",chances)
        else:
            start_over = 2
            print("Game Over! The word was ", random_item)
            print("Chance remaining:", chances)
            print("Final score:", score)

Python Shop Code

print ("welcone to our shop")
price=0
size=('s','m','l','xl')
colour=('red','black','white')
sock=('want','not want')

print (size)
shirt = (input('what shirt size do you want?'))
if shirt == ('s'):
        price = price+70
        print( "the price now is",price)
elif shirt ==('m'):
        price = price+80
        print( "the price now is",price)
elif shirt ==('l'):
        price = price+90
        print( "the price now is",price)
elif shirt ==('xl'):
        price = price+100
        print( "the price now is",price)
else:
        print("our shop doesn't have this size.")


print (colour)
shirtcolour= (input('what colour of shirt do you want?'))
if shirtcolour == ('red'):
        price = price+70
        print( "the price now is",price)
elif shirtcolour ==('black'):
        price = price+80
        print( "the price now is",price)
elif shirtcolour ==('white'):
        price = price+90
        print( "the price now is",price)
else:
        print("our shop don't have this colour")

print (size)
pant = (input('what pant size do you want?'))
if pant == ('s'):
        price = price+70
        print( "the price now is",price)
elif pant ==('m'):
        price = price+80
        print( "the price now is",price)
elif pant ==('l'):
        price = price+90
        print( "the price now is",price)
elif pant ==('xl'):
        price = price+100
        print( "the price now is",price)
else:
        print("our shop doesn't have this size.choose again")

Data Type Conversion

Function
Descri­ption
int(x [,base])
Converts x to an integer. base specifies the base if x is a string.
float(x)
Converts x to a floati­ng-­point number.
long(x [,base] )
Converts x to a long integer. base specifies the base if x is a string.
str(x)
Converts object x to a string repres­ent­ation.
repr(x)
Converts object x to an expression string.
comple­x(real [,imag])
Create a complex number.
eval(str)
Evaluates a string and returns an object.
tuple(s)
Converts s to a tuple.
list(s)
Converts s to a list
set(s)
Converts s to a set.
dict(d)
Creates a dictio­nary, d must be a sequence of (key,v­alue) tuples.
frozen­set(s)
Converts to a frozen set.
chr(x)
Converts an integer to a character.
unichr(x)
Converts an integer to a Unicode character.
ord(x)
Converts a single character to its interger value.
hex(x)
Converts an integer to a hexade­cimal string.
oct(x)
Converts an interger to an octal string.

Python Variables Types

Number
String
List
Tuple
Dictionary

Loop

While Loop
Repeats a statement or group of statements while a given condition is TRUE. It tests the condition before executing the loop body.
For Loop
Executes a sequence of statements multiple times and abbrev­iates the code that manages the loop variable.
Nested Loop
You can use one or more loop inside any another while, for or do..while loop.
 

Math

!=
unequal or not equal to
==
equal to
example;(a == b) is not true.
<
less than
example;(a < b) is true.
>
more than
example;(a > b) is not true.
<=
less than or equal
example;(a <= b) is true.
>=
more than or equal
example;(a >= b) is not true.
%
modulo or find the remainder
<>
If values of two operands are not equal, then condition becomes true.
example;(a <> b) is true. This is similar to != operator.

Vocabulary

variable
holds a value and can be changed.
string
a list of characters such as numbers, letters, symbols.
integer number
whole number or counting number.
float number
the number in decimal.
syntax
grammar structure of language.
value
the number or the string can be store in valuable.
loop
module
the text for storing for python code.
blank
comment
input
receives inform­ation from the user.
code
print
to show inform­ation.
syntax error
make possible to the parse
boolean
true/false

Statements

If Statement
if expres­sion:
statements
elif expres­sion:
statements
else:
statements
While Loop
while expres­sion:
statements
For Loop
for var in collec­tion:
statements
Counting For Loop
for i in range(s t art, end [, step]):
statements
(start is included; end is not)

Python Arithmetic Operators

Operator
Descri­ption
Example
+ Addition
Adds values on either side of the operator.
a + b = 30
- Subtra­ction
Subtracts right hand operand from left hand operand.
a - b = 30
* Multip­lic­ation
Multiplies values on either side of the operator.
a * b = 200
/ Division
Divides left hand operand by right hand operand.
b / a = 2
% Modulus
Divides left hand operand by right hand operand and returns remainder.
b % a = 0
** Exponent
Performs expone­ntial (power) calcul­ation on operators.
a ** b = 10 to the power 20
//
Floor Division - The division of operands where the result is the quotient in which the digits after the decimal point are removed.
9//2 = 4 and 9.0/2.0 = 4.0

Area of circle 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 circle 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 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 )

Print Code

name = "noey RAWIDA"
print (name.upper())
print (name.lower())
print (name.capitalize())
print (name.title())

List Code

shoppinglist = ['tshirt' , 'pants' , 'socks']

for myvariable in shoppinlist:
    print (myvariable)

print (shoppinglist[1])

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

Count Down Code

#create a program that receives a number from the user and count down from that number on the same line

#recive the number from the user as a string
user_number= input("enter number")

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

#setup the countdown string
countdown_string = ""

while number > 0:
    #add the number to the string
    #subtract 1 from the number
    countdown_string = countdown_string + str(number) + ""
    number = number-1

print (countdown_string)

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

Random Code 2

import random

intlist = [1,2,3,4]
random_int = random.choice(intlist)
print(intlist,random_int)

fplist = [1.0, 2.0, 3.0, 4.0]
random_fp = random.choice(fplist)
print(fplist,random_fp)

strlist =['book','pen','bag','pencil']
random_str = random.choice(strlist)
print (strlist,random_str)

mylist = [1, 1.0, 'beagle' ]
random_item = random.choice(mylist)
print(mylist,random_item)

myvar1 = 1
myvar2 = 2
myvar3 = 3
varlist =[myvar1, myvar2, myvar3]
random_var = random.choice(varlist)
print(varlist,random_var)
 

Metadata

  • Languages:
  • Published: 15th February, 2016
  • Last Updated: 10th May, 2016
  • Rated: 4 out of 5 stars based on 1 ratings

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