Python Cheat Sheet

def printdefinitions(word):
    if word == ("variable"):
        print ("""A variable is the value that can change""")
    elif word == ("function"):
        print ("""A function is the blog of code that can be reused""")
    elif word == ("parameter"):
        print ("""A parameter is something given to the function""")
    elif word == ("agrument"):
        print ("""An agrument is something given to the function""")
    elif word == ("string"):
        print ("""A string is a lsit of characters""")
    elif word == ("function call"):
        print ("""A function call makes your function run""")
    else:
        print ("Unknown word")
    return
while True: #keep the loop go forever
    user_input = input("Enter word: ")
    
    printdefinitions(user_input)

def printdefinitions(word):
    if word == ("variable"):
        print ("""A variable is the value that can change""")
    elif word == ("function"):
        print ("""A function is the blog of code that can be reused""")
    elif word == ("parameter"):
        print ("""A parameter is something given to the function""")
    elif word == ("agrument"):
        print ("""An agrument is something given to the function""")
    elif word == ("string"):
        print ("""A string is a lsit of characters""")
    elif word == ("function call"):
        print ("""A function call makes your function run""")
    else:
        print ("Unknown word")
    return
while True: #keep the loop go forever
    user_input = input("Enter word: ")
    
    printdefinitions(user_input)

Enter word: hello
Unknown word
Enter word: function
A function is the blog of code that can be reused
Enter word: variable
A variable is the value that can change
Enter word:
area/v­olume of

mystr = "hellp THERE"

print (mystr.upper()) -all letters will become big HELP THREE
print (mystr.lower()) -all letters will become small help three
print (mystr.capitalize()) -First letter of first word will become big Help three
print (mystr.title())- first letter of each words will become big Help Three

def max2(num1,num2):
    maxvalue = num1
    if num2 > maxvalue:
        maxvalue = num2
  
    return maxvalue


print (max2(4,5))
print (max2(33,5))


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

    if num2 > maxvalue:
        maxvalue = num2
    if num3 > maxvalue:
        maxvalue = num3
    
    return maxvalue
print (max3(1,2,3))

5
33
3

def maxlist(list):
    maxvalue = list[0]

    for item in list:
        if item > maxvalue:
            maxvalue = item

    return maxvalue
mylist = [1,2,3,4,55,66,777,0,1]
print(maxlist(mylist))
777

Rule for giving name
-letter
-numbers
-underscore_

Valid name
- _myStr
- my3
- Hello_there

Invalid name
- 3my="hi" -- cannot start with number
- first name = "hi"
- first-name
- first+name

def areaofcircle(radius):
    if radius <= 0:
        return "Error: invalid raadius"

    pi = 3.1415
    area = pi (radius*2)
    return area

user_radius = float(input("Enter the radius: "))

print('The area of the circle is', areaofcircle(user_radius))

Enter the radius: 2
The area of the circle is 12.566

Enter the radius: 0
The area of the circle is Error: invalid raadius

def isPalindrome(word):
    reverse = ""
    letter_num=0
    while letter_num<len(user_input):
        reverse = user_input[letter_num]+reverse
        letter_num = letter_num+1

    if reverse==word:
        return True
    else:
        return False
    
while True :

    user_input = input("Enter a word")

    if user_input == "quit":
        break
    

    isPal = isPalindrome(user_input)
    
    if isPal == True:
        print (user_input,'is parindorm')
    else:
        print (user_input,'is not parindorm')
        break
Enter a word113311
113311 is parindorm
Enter a word123
123 is not parindorm
Enter a wordquit

mystr = "Hello"

letter_num = 0

while letter_num < len(mystr):
         print (mystr[letter_num])
         letter_num = letter_num + 1


H
e
l
l
o

def myprint(text):
    print ("***" + str(text) + "***")

    return

myprint("opal")

hello it's bacon
***opal***

def myprintnew(text, decoration):
    print (decoration + str(text) + decoration)
    return
myprintnew("opal", "m")

hello it's bacon
***opal***
mopalm

def doubleit(number):
    return number * 2

print (doubleit(3))
print (doubleit(doubleit(4)))


hello it's bacon
***opal***
mopalm
6