Python Functions and Syntax

if/else function

if [condition]:
	[action]
else:
	[action]

if/elif/else function

if [condition]:
	[action]
elif [condition]:
	[action]
else:
	[action]

Gives type of item

type([item])

Assigns user input to variable

variable = input("[question]")

String

Type that user input returns

List

numbers = [1, 2, 3]

Array

numbers = np.array([1, 2, 3])

Place terms in order

list.sort()

Prints term in list

print(list[x])

Set value of term

list[x] = ...

Gives length of list

len(list)

Adds term at end of list

list.append([term])

Replaces value of term

list.insert([term], [replacing value])

Removes last term

list.pop()

Removes specific term

list.pop([term])

Clears list

list.clear()

Slices list

list[start:end:step]

Iteration

for [variable] in [list]:
	[action]

Iterator object

iter()

Gives numbers in range

range(start, stop, step)

Performs action for numbers in range

for i in range(start, stop, step):
	[action]

for loop

Executes a block of code for each element

while loop

Continuation of block of code until a certain criteria is met

Continues action for given condition

while [condition]:
	[action]

Terminates loop

break

Defines function

def function():
	[function]

Defines function with parameter

def function([parameter]):
	[function]

Generators integer between limits

random.randint([lower], [upper])

Import all functions from package

from [package] import *

Import specific function from package

from [package] import [function]

Import function with shorthand

import [package] as [shorthand]

Checks for type of argument

isinstance([variable], [type])

Shows error message

raise Value Error

Catches exception

try:
	[action]
except:
	[action]

Rounds to 2 decimal places

number:.2f

Rounds to 4 decimal places

number:.4f

User Friendly

Try/except error user friendliness

Not User Friendly

Raise error user friendliness

end=’ ‘

kwarg for print function that makes printing all on one line (rather than starting a new line each print instance)