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Python cheat sheet - Cliff Cheat Sheet by

Function

print()
display given info.
input()
receives info from user
int()
converts a value to an integer
float()
converts a value to a floationg point
str()
converts a value to a string
len()
the length of the string
==
equal to
<=
less than or equal to
>=
more than or equal to
%
Modulo, Find the remainder
#
Comment, no effect on progra­mming
whlie True
continues
for
looping forever
if...then
"if true" will work, "if false" won't work loop stops
//
int outcome
/
float outcome

Multip­lic­ation and Exponent

string * string
Crash
string­*number
combines the string multiple times
number­*number
Math - Multiply
string­**n­umber
Crash
number­**n­umber
Math - Exponent
string­**s­tring
Crash

Max Value in list / Max value

def max2(num1,num2):
    maxvalue = num1
    if num2 > maxvalue:
        maxvalue = num2
    return maxvalue
print (max2 (4,3))
print (max2 (3,22))

answer = max2 (1,5)
print (answer)

def max3(num1,num2,num3):
    maxvalue = num1
    if num2 > maxvalue:
        maxvalue = num2
    if num3 > maxvalue:
        maxvalue = num3
    return maxvalue
print (max3 (10,7,8))
print (max3 (7,10,8))
print (max3 (7,8,10))

def maxlist(list):
    maxvalue = list[0]
    for num in list:
        if maxvalue < num:
            maxvalue = num
    return maxvalue
print (maxlist(range(0,101)))
mylist = 1,5,76,23,78,34,5678,2,5,8,675,2,6,86,54,23,6,8
print (maxlist(mylist))

Palindrome

"""
Cliff 1003
"""
def isPalindrome (word):
        index = 0
 # word[0] len(word)-1 -0
        numberOfLoops = 0
        while index < 1/2*len(word):
           numberOfLoops += 1
           print('Comparing',word[index] ,word[len(word)-1-index])
           if word[index] == word[len(word)-1-index]:
                index = index + 1
           else:
                print ('loops:',numberOfLoops)
                return False
                   
        print ('loops:',numberOfLoops)
        return True


while True:
    user_input =input("what is your word? ")
    if user_input == "quit":
        break
    print (len(user_input))

    myword = isPalindrome(user_input)
    if myword == True:
        print ((user_input),"is a palindrome")
    else:
        print ((user_input),"isn't a palindrome")

commands

import
imports program
random
given written program
random.ch­oice()
random items in the list

Randomizer

import random

intlist = [1,2,3,4,5]
random_int = random.choice(intlist)
print (intlist,random_int)

fplist = [2.0,2.1,2.2,2.3,2.4,2.5]
random_fp = random.choice(fplist)
print (fplist,random_fp)

strlist = ['a','b','c','d','e','f']
random_str = random.choice(strlist)
print (strlist,random_str)

mylist = [1,9.9,"hello"]
random_mylist = random.choice(mylist)
print (mylist,random_mylist)

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

Vocabulary

Variable
something that can change
String
a list of characters
Print
display given info.
Syntax
Gramma­r/S­tru­cture of language
Modulo
Find the remainder
Boolean
True/False

Reverse word

while True
word = input("Please enter a word")
index = 0
reverse = ""

while int(index) < len(word)
    reverse = word[index] + (reverse)
    index = int(index) + 1

print ("Reverse: ", reverse)

Finding the triangle (area,­volume)

def areaoftriangle(num1,num2):
    area = 1/2num1num2
    return area

user_base = float(input('what is your base of the triangle; '))
user_height = float(input('what is your height of the triangle; '))
print ('The area of the triangle is: ',areaoftriangle(user_base,user_height))


def volofprism(base,height,prism_height):
    volume = areaoftriangle(base,height) * prism_height
    return volume
user_prism = int(input('Enter the prism height; '))
print ("The volume of the prism is; ", volofprism(user_base,user_height,user_prism))

Guessing Game

import random

score = 0
chances = 5
print ("Score:", score)
print ("Chances:", chances)

mylist = ['apple', 'banana', 'orange', 'mango', 'cherry']

print (mylist)

random_item = random.choice(mylist)

while chances > 0 :
    user_guess = input("Guess a word:")
    if user_guess == random_item:
        print ("That's correct!")
        score = score+100
        print ("Score:", score)
        print ("Chances:", chances)
        random_item = random.choice(mylist)
    else:
        if user_guess in mylist:
            print ("Sorry, wrong choice!")
            chances = chances-1
            print ("Score:", score)
            print ("Chances:", chances)
        else:
            print ("Sorry, that is not even in the list")
            chances = chances-1
            print ("Score:", score)
            print ("Chances:", chances)
print ("Game over! The word was", random_item)
print ("Final Score", score)

Convert into binary

user_number = ""

while user_number != ' 0 ':
    user_number = input ("Enter a number to convert into 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)

Condit­ionals

if else
if the statement is true then do the command under. Else do command under else
elif
Similar to if else, but allows more condit­ions. (short abbrev­iation for if else
for loop
Will loop through every element of the set
while loop
A loop condition with conditions 1.initial value 2.ending condition 3.update
while true
While the statement is true keep looping
Concat­enation
Joins the strings by linking then end to end
 

True / False

True or ... / ... or True
True
False and ... / ... and False
False

Math Operation Function Writing

def calc(num1,num2,operation):
    if operation == "sum":
        return sum(num1,num2)
        
    elif operation == "product":
        return product(num1,num2)
        
    elif operation == "diff":
        return diff(num1,num2)
       
    elif operation == "div":
        return div(num1,num2)
        
def sum(a,b):
    return (a+b)
    
def product(a,b):
    return (a*b)
def diff(a,b):
    return (a-b)
def div(a,b):
    if b != 0 :
        return a//b
    else:
        print ("ERROR")

print(calc(10,0,"div"))
print(calc(1,2,"sum"))
print(calc(4,2,"diff"))
print(calc(9,3,"div"))
print(calc(2,12,"product"))

22/03/16 code

'''
theList = ['1','2','3']
for item in theList:
    print(item)
'''
'''
index = 0
whileList = ['1','2','3','4']
while index < len(whileList):
    print (whileList[index])
    index = index + 1
'''
"""
while True:
    user_input = (input("your word?: "))
    print ("your length of the word is: ",len(user_input))
    if user_input == "exit":
        break
"""
"""
def theFunction():
    while True:
        user_input = input("word: ")
        if user_input == "stop":
            break
theFunction()
"""
"""
def computeThis(a1,b2):
    product = a1*b2
    print (product)
    return
computeThis (2,5)
"""
"""
def finalFunction(string):
    print ("*",(string),"*")
    return
finalFunction ("cliff")
"""

print item using while

index = 0
whileList = ['1','2','3','4']
while index < len(whileList):
    print (whileList[index])
    index = index + 1

Naming Convention

Rules for giving names
- letter
- numbers
- unders­core_

Valid name
- _mystr
- my6
- Kawazo­e_K­yousuke

Invalid name
- 3my = "­wha­tev­er" #can't start with a number
- Kawa zoe = "­wha­tev­er" #can't have space
- first-name = "­som­thi­ng" #can't have "­-"

Countdown Machine

user_n­umber = input(­"What number do you want to countdown? ")
number = int(us­er_­number)
countd­own­_string = ' '

while number > 0
countdown = countd­own­_string - str(nu­mber) + " "
number = number - 1
#print­(nu­mber)

print (count­dow­n_s­tring)

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