Beta

## Introduction to Python

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

```
# Importing course packages; you can add more too!
import numpy as np
import math
import pandas as pd
import matplotlib.pyplot as plt
# Import columns as numpy arrays
baseball_names = np.genfromtxt(
fname="baseball.csv", # This is the filename
delimiter=",", # The file is comma-separated
usecols=0, # Use the first column
skip_header=1, # Skip the first line
dtype=str, # This column contains strings
)
baseball_heights = np.genfromtxt(
fname="baseball.csv", delimiter=",", usecols=3, skip_header=1
)
baseball_weights = np.genfromtxt(
fname="baseball.csv", delimiter=",", usecols=4, skip_header=1
)
baseball_ages = np.genfromtxt(
fname="baseball.csv", delimiter=",", usecols=5, skip_header=1
)
soccer_names = np.genfromtxt(
fname="soccer.csv",
delimiter=",",
usecols=1,
skip_header=1,
dtype=str,
encoding="utf",
)
soccer_ratings = np.genfromtxt(
fname="soccer.csv",
delimiter=",",
usecols=2,
skip_header=1,
encoding="utf",
)
soccer_positions = np.genfromtxt(
fname="soccer.csv",
delimiter=",",
usecols=3,
skip_header=1,
encoding="utf",
dtype=str,
)
soccer_heights = np.genfromtxt(
fname="soccer.csv",
delimiter=",",
usecols=4,
skip_header=1,
encoding="utf",
)
soccer_shooting = np.genfromtxt(
fname="soccer.csv",
delimiter=",",
usecols=8,
skip_header=1,
encoding="utf",
)
```

### 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`

```
df = pd.read_csv('soccer.csv')
df
```

### 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'`

)?

### - Print out the weight of the first ten baseball players.

```
#- Print out the weight of the first ten baseball players.
baseball= pd.read_csv('baseball.csv')
baseball[['Weight']].head(10)
```

### - What is the median weight of all baseball players in the data?

`print(baseball[["Weight"]].median())`

`Weight 200.0`

```
#- What is the median weight of all baseball players in the data?
print(baseball[["Weight"]].median())
#baseball[["Weight"]].mean()
```

### - Print out the names of all players with a height greater than 80 (heights are in inches).

```
#- Print out the names of all players with a height greater than 80 (heights are in inches).
#height_80 = baseball['Height'] > 80
#baseball[height_80]
height_80 = baseball[baseball['Height'] > 80]
height_80[['Name', 'Height']]
```

### - Who is taller on average? Baseball players or soccer players? Keep in mind that baseball heights are stored in inches!

```
#- Who is taller on average? Baseball players or soccer players? Keep in mind that baseball heights are stored in inches!
inchtocm = baseball['Height'] * 2.54
#inchtocm= baseball[baseball['Height'] * 2.54]
baseball_avgh = inchtocm.mean()
print(baseball_avgh)
soccer_avgh = df['height'].mean()
print(soccer_avgh)
#==========================
# Calculate the average height of baseball players in inches
baseball_avg_height = baseball['Height'].mean()
# Convert the average height of baseball players to cm
baseball_avg_height_cm = baseball_avg_height * 2.54
# Calculate the average height of soccer players in cm
soccer_avg_height_cm = df['height'].mean()
# Compare the average heights and print the result
if baseball_avg_height_cm > soccer_avg_height_cm:
print(baseball_avg_height_cm, ".", "Baseball players are taller than soccer players on average.")
else:
print(baseball_avg_height_cm, "Soccer players are taller than baseball players on average.")
```