Skip to content

Introduction to Python

Run the hidden code cell below to import the data used in this course.

1 hidden cell

Take Notes

Add notes about the concepts you've learned and code cells with code you want to keep.

Add your notes here

# Add your code snippets here

Explore Datasets

Use the arrays imported in the first cell to explore the data and practice your skills!

  • Print out the weight of the first ten baseball players.
  • What is the median weight of all baseball players in the data?
  • Print out the names of all players with a height greater than 80 (heights are in inches).
  • Who is taller on average? Baseball players or soccer players? Keep in mind that baseball heights are stored in inches!
  • The values in soccer_shooting are decimals. Convert them to whole numbers (e.g., 0.98 becomes 98).
  • Do taller players get higher ratings? Calculate the correlation between soccer_ratings and soccer_heights to find out!
  • What is the average rating for attacking players ('A')?

float = number w/ decimals (floating point) int = integer str = string bool = t/f

Python Lists Use square brackets ex -> fam = [1.73, 1.68, 1.71, 1.89]

List names a collection of values fam = ["liz", 1.73, "emma", 1.68, "mom", 1.71, "dad", 1.89] fam2 = [["Liz", 1.73],etc]

Function/behavior of a list

The first in a list is 0 (0 indexing), the last in a list is -1 3:5 = only 4th and 5th, the 6th (5+1) is not included

Manipulating Lists change/add/remove from lists

"fam[7] = 1.86"

fam[0:2] - changes first and second list items BECAUSE index 2 is NOT included

del(fam[2]) removes element at index 2

name of list = reference to the list

copy a list by y = list(x)

y = x[:]

otherwise Y ACTUALLY equals X

Functions Piece of reusable code, solves particular task type returns variable type max returns highest number in a list

round(#, # of decimal places)

How to find functions? Learn w/ time standard tasks probably exist -- Google it!

methods: functions that belong to objects

EVERYTHING IS AN OBJECT each object has methods associated, depending on type

Append adds to end of list

Packages in Python Directory of python scripts NumPy Matplotlib scikit-lib --> http://pip.readthedocs.org/en/stable/installing get-pip.py python3 get-pip.py pip3 install numpy

Python can't do calculations on lists; but it can on arrays with NumPy

NumPy arrays only contain one type; if you try to mix types, it will convert them to one single type

Attribute - no round brackets

2D arrays ; rows and colums. First index = row, second index = column Just a : selects whole row/column

np.mean = mean function from the mean

corrcoef = correlated? std = standard deviation