#WEEK ONE EXAMPLES: 
import numpy as np
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#Variable declarations 

x = 5
y = 7
z = 2.*x + 5.*y
alpha = y**2.

list_1 = [1,2,3,'cat',['dog',5,6],9.] #any datatype, even lists within lists
list_2 = range(100)                   #would make a list of integers 0-99
arr_1 = np.array([1,2,3,4,5])
arr_2 = 5 + arr_1                     #Adds 5 to every entry in arr_1 



#Recasting variables
x2 = float(x) #essentially, adds a decimal to whatever argument is- turns to float
str1 = str(y) #puts the argument in quotes to make it a string
z2 = int(z) #If a float, rounds it down to nearest integer
            #If a string, extracts numbers and makes it an integer (rounding if needed)