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phython note Cheat Sheet

A Programming › Python cheat sheet in English by ppinkyy

phython

Phyton
14,294 views 3,040 downloads 15 Feb 2016 History
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funtion

print
Show inform­ation on the screen
int
to tell that what you write is a number
float
change number to be decimal number
str
list of number, letter and symbol

Addition

str+str
the result combine together
str+ int or float
crash
int/float + int/float
math - addition

Multip­­li­c­ation and Exponents

string­*string
crash
string­*number
combine string together
number­*number
math-m­ultiply
number ** number
math-e­xponent
string ** string
crash
string­**n­umber
crash

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

numb = int(in­put­('enter the number to convert to binary­'))
bistring = '­'

while numb>0 :
rem = numb%2
bistring = str(re­m)+­bis­tring
numb = numb//2
print ('Binary Number : ', bistring)

Naming Convention

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

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)

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

fuction 

def myprint(text) :
    print ('xxx'+str(text)+'xxx')

myprint (1)
xxx 1 xxx

Function (return number) Ex 



def doubleIt (number):
    return number *2
print (doubleIt(2))
print (doubleIt('hello'))

myvar = doubleIt(doubleIt(3))
print (myvar)
4
hellohello
12

symbol

==
equal
!=
not equal
>
greater than
<
less than
>=
greater than or equal to
<=
less than or equal to

Vocabulary

variable
hold a value and can be change
string
a list of character such as number, letter and symbols
integer
a number without decimal
float
number in dicimal
syntax
structure of language
value
returns a list of all the values available in a given dictio­nary.
while
it's a loop that will go over and over until you stop it
loop
tradit­ionally used when you have a piece of code which you want to repeat n number of times
input
Run the program. In the Shell you should see
print
to show inform­­ation on the
modulo
leave remainder
#
Comment, no effect
randon.choice
program that someone wrote
import random
to get get a random program from someone
import
to import program from someone
import random + random.ch­­oice()
pick random item in the list
palindrome
is derived from the Greek palínd­romos, meaning running back again

Guess word game

import random

#Create a list

guesslist = ['gr­ape­', '­ora­nge­', '­chl­oro­pla­st', '­rib­oso­me', '­lip­sti­ck']

chance = 3
score = 0

print (guess­list)

while chance != 0:
random­_item = random.ch­oic­e(g­ues­slist)
user_input = input(­"­Please guess a word: ")
if user_input == random­_item:
print ("Th­at's correc­t!")
score = score + 100
print ("Sc­ore­:", score)
else:
if user_input not in guesslist:
print ("Sorry, that isn't even in the list!")
chance = chance - 1
print ("Chance Remain­ing­:", chance)
else:
print ("Sorry, wrong choice­!")
chance = chance - 1
print ("Chance Remain­ing­:", chance)

if chance == 0:
print ("The word was", random­_item)
print ("The score is", score)

Sort word 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

fuction 

def bacon():
    print ('bacon')
    print ('egg')
    print ('text')
    print ('gta')
    print ('guildwar')
    print ('magalodon')
    return
bacon()
bacon()
bacon
egg
text
gta
guildwar
magalodon
bacon
egg
text
gta
guildwar
magalodon

Example

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

r = input ('enter the radius of the circle : ')
r = float(r)

print ('the area of the circle is', circle­are­a(r))
enter the radius of the circle : 5
the area of the circle is 78.537­500­000­00001
>>>

Example

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

r = input ('enter the radius of the circle : ')
r = float(r)

print ('the area of the circle is', circle­are­a(r))
enter the radius of the circle : 5
the area of the circle is 78.537­500­000­00001
>>>

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