Python Cheat Sheet by pinpin

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 )

import random
intlist = [1,10,100]
random_int = random.choice(intlist)
print(random_int,intlist)

fplist = [2,20,200]
ramdom_fp =  random.choice(fplist)
print(ramdom_fp,fplist)

strlist = ('Pin','Anpan','Bella')
ramdom_str =  random.choice(strlist)
print(ramdom_str,strlist)

mylist = [1,10,100,2,20,200,'Pin','Anpan','Bella']
ramdom_item =  random.choice(mylist)
print(ramdom_item,mylist)

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

def bacon():
    print("hello it's bacon")
    print("line 2")
    print("line 3")
    print("line 4")
    return
bacon()
bacon()
bacon()

def myprintnew (text, decoration):
    print(decoration + str(text) + decoration)
    return
myprintnew(1, "+++")
myprintnew('hello','-=-=-=-=-=-=-=-=')
myprintnew(1, "@@@@@@@")

def areaofTriangle(b, h):
    area = 0.5  b  h
    return area
user_base = float(input('Enter the base of the triangle:'))
user_height = float(input('Enter the height of the triangle:'))
print('The area of the triangle is',areaofTriangle(user_base, user_height))

def volumeofPrism(b,h,l):
    volume = areaofTriangle(b, h) *l
    return volume
user_lenght = float(input('Enter the length of the prism: '))
print('The volume of the prism is',volumeofPrism(user_base, user_height, user_lenght) )

Print (2) – integer
Print (2.5) – floating point
Print (“Hello”) – string
Print (mystr) – variable
Print (mystr­­,”­H­i­”,­­2,1.0) -- commas

mystr = “Hi”
mystr ← name
“Hi” ← value can change

print (int(1.5)) → 1
print (int(“2”)) → 2
print (float(1)) → 1.0 anything to a float

Modulo­­/R­e­m­ainder %
print (4%2) → 0
print (30%7) → 2

def myprint(text):
    print("" + str(text) + "")
    return
myprint(1)
myprint("hello")
myprint(2.5)

def areaOfCircle(r):
    if r <= 0:
        return "Error: invalid radius"
    pi = 3.1415
    area = pi  r * 2
    return area
user_radius = float(input("Enter the radius:"))
print ('The area of the circle is', areaOfCircle(user_radius))

_var1 = 1
_var1 = 3
_var1 + 100
print(_var1)

def maxlist(list):
    maxvalue = list[0]
    for item in list:
        if item > maxvalue:
            maxvalue = mylist
    return maxlist
mylist = [21365741,2135416,2,54131,1.1515]
print(maxlist(mylist))

def max2(num1,num2):
    maxvalue = num1
    if num2 > maxvalue:
        maxvalue = num2    
    return maxvalue
print('The largest number is',max2(2,3))
print('The largest number is',max2(12222,10))

def max3(num1,num2,num3):
    maxvalue = num1
    if num2 > maxvalue:
        maxvalue = num2
    if num3 > maxvalue:
        maxvalue = num3
            
    return maxvalue
print('The largest number is',max3(1,5,10))
print('The largest number is',max3(12222,5,10))
print('The largest number is',max3(12222,164.3415645,121348561240))

mystr = "hello THERE"
print (mystr.upper())
print (mystr.lower())
print (mystr.capitalize())
print (mystr.title())

user_number = input("Please enter a number: ")

number = int(user_number)

countdown_string = ''

while number > 0:
        countdown_string = countdown_string+ str(number)
    
        number = number-1

print (countdown_string)

def printDefinitions(word):
    if word =="variable":
        print ('....')
    elif word =="function":
        print ('....')
    elif word =="parameter":
        print ('....')
    elif word =="argument":
        print ('....')
    elif word =="function call":
        print ('....')
    elif word=="string":
        print ('....')
    else:
        print("unknown word")
    return
while True:
    user_input = input("Enter word: ")
    printDefinitions(user_input)

def areaofTriangle(b, h):
    area = 0.5  b  h
    return area
user_base = float(input('Enter the base of the triangle:'))
user_height = float(input('Enter the height of the triangle:'))
print('The area of the triangle is',areaofTriangle(user_base, user_height))

def volumeofPrism(b,h,l):
    volume = areaofTriangle(b, h) *l
    return volume
user_lenght = float(input('Enter the length of the prism: '))
print('The volume of the prism is',volumeofPrism(user_base, user_height, user_lenght) )

def doubleIt(number):
    return number*2
print (doubleIt(3))
print (doubleIt(doubleIt(4)))

myvar = 12
myvar= doubleIt(myvar)
myvar= doubleIt(myvar)
print(myvar)