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Cheatography

ritttt Cheat Sheet by

Vocab

Variable
Hold a value and can be change
String
A list of character such as number, letter and symbols
Integer number
whole number/ counting number
Float point
The number in decimal
syntax
Gramma­r/S­tru­cture of lauguage
Modulo
Find the remainder
Boolean
True/False

Example

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

Sort per line

mystr = "­Hel­lo"

letter_num = 0

while letter_num < len(my­str):
print (mystr­[le­tte­r_num])
letter_num = letter_num + 1
H
e
l
l
o

Print name

 
name = "tim GIRARD­­"

print (name.u­­p­p­er()) → TIM GIRARD
print (name.l­­o­w­er()) → tim girard
print (name.c­­a­p­i­ta­­lize()) → Tim girard
print (name.t­­i­t­le()) → Tim Girard

Basiccode

print()
Show inform­ation that you want on the screen
input()
Gain inform­ation from user
len()
The length of the string
int()
Change number to be number integer
float()
Change number to be decimal number
str()
A list of number, letter and symbols
#
Comment
 

Addition

string + string
Combine together
string + number
crash
number + number
addition

Multip­lic­ation

string * number
combine that string multiple times
string * string
crash
number * number
multiply
string ** string
crash
number ** number
exponents
string ** number
crash

Naming Convertion

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

Area of circle

"­"­"
Python Intro Assignment #2
name
student number
"­"­"

#Ask the user for a radius of a circle
user_r­adius = input(­"What is a radius of a circle­?")

#Convert the given radius to a floating point
radius = float(­use­r_r­adius)

#Make a variable called pi
pi = float(­3.1415)

#Calculate the area of the circle using exponents
area = pi(ra­diu­s*2)

#Display the area of the circle to the user
print ("The area of the circle is", area)

Math

==
equal to
!=
no equal to
<
less than
>
more than
<=
less than or equal
>=
more than or equal to
%
modulo, find the remainder
 

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)

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 count down? ")
number = int(us­er_­number)
countd­own­_string = ' '

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

print (count­dow­n_s­tring)

Sort fruit list

fruits = [] #an empty list

for number in range(5):
user_fruit = input(­­"­P­lease enter a fruit")
fruits.ap­­pe­n­d­(u­­ser­­_f­ruit)

print ("Size of fruit list is", len(fr­­uits))

fruits.sort()

for fruit in fruits:
print ("Fruit: ", fruit)

random.choice

import random

intlist = [9,8,7,6,5,4]
random_int = random.choice(intlist)
print (intlist, random_int)

fplist = [0.2,0.3,0.3]
random_fp = random.choice(fplist)
print (fplist, random_fp)

strlist = ["ABC", "BCA", "CAB"]
random_str = random.choice(strlist)
print (strlist, random_str)

mylist =[1,3,6,12,"ABC", "DEF", "HIJ"]
random_item =random.choice(mylist)
print (mylist, random_item)

myvar1 = 1
myvar2 = 2
myvay3 = 3
varlist =[myvar1, myvar2, myvar3]
random_var = random.choice(varlist)
print (varlist, random_var)

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