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Python 123 Cheat Sheet by

Vocabulary

Variable
Something that can be change
String
A list of characters
Integer Number
Whole number­/co­unting number
Float Number
The number in decimal
Syntax
Grammar
Modulo
Remainder
Boolean
True&­False

Function

print()
display info. on the screen
input()
receives info from the user
int()
convert a value to an interger
float()
convert a value to a floating point
str()
convert a value to a string
len()
The length of the string
#
comment
if then else
if ... is True "­the­n" will work or if it False then "­els­e" will work
While: True
Forever Loop
for
Looping Forever

Function largest number

def max2(num1,num2):
    if num1 > num2:
        maxvalue = num1
    elif num2 > num1:
        maxvalue = num2
    return maxvalue
    
#function call
print(max2(92,3))
print(max2(4,5))

def max3(num1,num2,num3):
    maxvalue = num1

    if num2 > maxvalue:
        maxvalue = num2
    elif num3 > maxvalue:
        maxvalue = num3
    return maxvalue

#function call
print(max3(92,5,6))
print(max3(8,9,7))
print(max3(99,40,49))

def maxlist(list):
    maxvalue = list[0]
    for num in list:
        if maxvalue < num:
            maxvalue = num
    return maxvalue

mylist = 3,5476,134,8,451,87
print (maxlist(mylist))

Naming Convention

Rules for giving name
-letter
-numbers
-under­scores
Valid Name
- _myStr
- my3
- Hello_­there
Invalid Name
- 3mt = "­hi" -- cannot start with number
- first name = "­hi"
- first-name

Volume and Triangle

def areaOfTriangle(base,height):
    area=1/2 base height
    return(area)

user_base = float(input('Enter the base of the triangle: '))
user_height = float(input('Enter the height of the triangle: '))

#function call
print('The area of the triangle is',areaOfTriangle(user_base,user_height))


def volumeOfPrism(base,height,prism_height):
    volume = areaOfTriangle(base,height) * prism_height

    return (volume)

user_prism_height = float(input('Enter the prism height:'))
print ('the volume of the prism is', volumeOfPrism(user_base, user_height, user_prism_height))

Palindrome

def isPalindrome(word):
    if reverse_item == user_word:
        return "true"
    else:
        return "false"
while True:
    user_word = input('What is the word: ')
    length = len(user_word)
    if user_word == 'quit':
        break
    else:
        print("Length of the word is: ",(length))
        
    reverse = ""

    for item in user_word:
        reverse = item + reverse

    reverse_item = reverse

    s = 0
    while s < length / 2 + 1 :
        if reverse_item[s] == user_word[s]:
            print(user_word, "is a palindrome")
            break
            s = s + 1
        else:
            print(user_word, "is not a palidrome")
            break
 

Math

= =
equal to
!=
not equal to
<
less than
>
greater than
<=
less than or equal to
>=
greater than or equal to
%
Modulo, Find the remainder

Addition

String + String
combine together
string + number
CRASH
number + number
math

Multip­lic­ation and Exponent

string * number
combine the string
string * string
CRASH
number * number
math
string ** string
CRASH
number ** number
Math
string ** number
CRASH

Example

Print (2) -interger
Print (2.4) - Floating Point
Print (myStr) - variable
Print ("He­llo­") - string
Print (myStr­,"Hi­"­,2,1,0) -- commas
myStr = "­Hi"
mystr - name
"­Hi" - value can change
print (int(1.5)) - 1
print (float(1)) - 1.0
print (4%2) - 0

Randomizer

"""
Group member: Kim, Pop, and Earn

Group: 10-03
"""
import random
mylist = ('lion' , 'tiger' , 'dog' , 'bee' , 'cat')
print (mylist)
random_item = random.choice(mylist)
print (random_item)
chance = 7
score = 0
while chance > 0:
    user_guess = input("Guess a word: ")

    if user_guess == random_item:
        score = score + 100
        print ("That's Correct!")
        print ('score=',(score))
        random_item = random.choice(mylist)
        
    else:

        if user_guess in mylist:
            chance = chance - 1
            print ("Sorry, wrong choice")
            print ("chance =", (chance))
            print ("The word is: ",random_item)
            random_item = random.choice(mylist)
            print ("score",(score))
        else:
            chance = chance - 1
            print ("Sorry, that is not even in the list")
            print ("chance =", (chance))
            random_item = random.choice(mylist)
            print ("score",(score))

    if chance == 0:
        print ("GAME OVER!")
        print (' Answer =', (random_item))
        print ("Final Score =", (score))

Area

def areaOfCircle(r):
    pi = 3.1415
    area = 2pir
    return area

user_radius = float(input("Enter the radius: "))
print("The area of the circle is", areaOfCircle(user_radius))

Calcul­ating Program

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):
    return (a / b)

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

Palind­rome2

'''
Kim Jaroensattayatham(1003)
'''
def isPalindrome(word):
    index = 0
    reverse = ""
    while int(index) < len(word):
        reverse = word[index] + reverse
        index = int(index) + 1

    if reverse == user_input:
        return "true"
    else:
        return "false"

while True:
    user_input = input("please enter the word")
    if user_input == "quit":
        break
    print(len(user_input))
    print(isPalindrome(user_input))
 

Reverse Word

while True:
word = input(­"­enter your word")
index = 0
reverse = ' '

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

print(­"­Rev­erse: ", reverse)

Convert To BInary

user_n­umber = ' '

while user_n­umber != ' 0 '
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)

Countdown Machine

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

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

print(­cou­ntd­own­_st­ring)

IMPORT

import random

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

fplist = [1.0,1.2,1.3]
random_fp = random.choice(fplist)
print(fplist, random_fp)

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

mylist = [1,1.0,'hello']
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)

Asking Name Code

firstname = input(­" what is your firstname? ")
lastname = input(­" what is your lastna­me?­")

fullname = firstname + " " + lastname

print (fullname)

letternum = int(in­put­(" what is the letter number? "))

if len(fu­llname) < letternum :
print(­"­Invalid letter number, try again! ")
else :
print (fulln­ame­[le­tte­rnum])

letter­print = int(in­put­(" how many time to print letter "))
if letter­print > 100 :
print (" too many letters to print ")
else :
print (fulln­ame­[le­tte­rnum] * letter­print)

rdtfghjbkn

'''
theList = ('A' , 'B' , 'C' , 'D')
for item in theList:
    print (item)
whileList = ('a' , 'b' , 'c')
index = 0
while index < len(whileList):
    print(whileList[index])
    index = index + 1

while True:
    user_input = input("Enter your word")
    print (len(user_input))
    if user_input == "exit":
        break

def theFunction():
    while True:
        user_input = input ("Enter the word:")
        if user_input == "stop":
            break
#call the function
theFunction()

def computeThis(a1,b2):
    theproduct = a1 * b2
    print(theproduct)
    return
computeThis(1,2)
'''

def finalFunction(string):
    print("*",string,"*")
    return
finalFunction("Kim")

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