This is a draft cheat sheet. It is a work in progress and is not finished yet.
Addition
string + string |
combine togeth |
string + number |
crash |
number + number |
math-addition |
Multiplication and Exponents
string * number |
combine that string multiple times |
string * string |
crash |
number * number |
math - multiply |
string ** string |
crash |
number ** number |
Conditionals
if else |
If the statement is true then do command under then else do command under else. |
elif |
Similar to if else, but elif allows for more conditions (The keyword ‘elif‘ is short for ‘else if’) |
for loop |
For loop will loop though every element of the set of elements |
while loop |
Loop Contains 3 basic parts: 1. initial value 2. ending condition 3. update |
Convert to binary Python (cont)
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)
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User input
user_input = input("Enter a value: ") |
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Function
print() Show information that you want on the screen
int() Change number to be number integer float() Change number to be decimal number
input() Gain information from user
str() A list of number, letter and symbols
len() The length of the string # Comment, no effect
# Comment, no effect |
code
print (name.upper()) |
print (name.lower()) |
print (name.capitalize()) |
print (name.title()) |
Excample
Print (2) |
integer |
Print (2.5) |
floating point |
Print ("Hello) |
string |
Print (mystr) |
variable |
print (int(1.5)) = 1 |
print (int("2')) = 2 |
Modulo/Remainder % |
print (4%2) → 0 |
print (30%7) → 2 |
Area of circle Python
#Ask the user for a radius of a
circle
while True:
user_radius = input("Please
enter the radius of the circle:")
radius = float(user_radius)
pi = 3.1415
area = (piradius*2)
print("The area of the circle
is", area
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Vocabulary
variable |
holds a value and can be changed |
string |
a list of characters such as numbers, letters, symbols |
Floating point |
decimal number |
Integer |
is a whole number (not a fractional number) that can be positive, negative, or zero |
Boolean |
True or false |
* |
Called star or asterix symbol |
( ) |
Called index |
** |
power |
< |
less than |
> |
more than |
<= |
less than or equal |
>= |
more than or equal |
= |
operator / assigns a value |
== |
compare two values Answer is True or fulse |
!= |
no equal to |
% |
modulo, find the remainder |
function |
blocks of reusable code |
Constants |
Data stored in memory that cannot be changed after declaration |
Compile |
Run the program |
Debug |
Check the program for errors |
syntax |
Grammar/Structure of language |
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)
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