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Start your free trialJonathan Grieve
Treehouse Moderator 91,253 PointsTypeError: The Scatter Chart is not being generated
I'm trying to generate the scatter chart as shown in the video but my cell keeps generating a TypeError in Jupyter. I can't what's gone wrong. Line 17 should allow me to use the list in this way shouldn't it?
from itertools import groupby
import csv
import matplotlib.pyplot as plt
input_file = 'iris.csv'
with open(input_file, 'r') as iris_data:
irises = list(csv.reader(iris_data))
colors = {"Iris-setosa": "#2B5B84", "Iris-versicolor": "g", "Iris-virginica": "purple"}
irises.pop()
for species, group in groupby(irises, lambda i: i[4]):
categorised_irises = list(group)
sepal_lengths = [float(irises[0]) for iris in categorised_irises]
sepal_widths = [float(irises[1]) for iris in categorised_irises]
plt.scatter(sepal_lengths, sepal_widths, s=10, c=colors[species], label=species)
plt.title('Fisher\'s Iris Data Set', fontsize=12)
plt.xlabel('sepal length (cm)', fontsize=10)
plt.ylabel('sepal width (cm)', fontsize=10)
plt.legend(loc='upper right')
plt.show()
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-8-773bcecd5933> in <module>()
15 for species, group in groupby(irises, lambda i: i[4]):
16 categorised_irises = list(group)
---> 17 sepal_lengths = [float(irises[0]) for iris in categorised_irises]
18 sepal_widths = [float(irises[1]) for iris in categorised_irises]
19 plt.scatter(sepal_lengths, sepal_widths, s=10, c=colors[species], label=species)
<ipython-input-8-773bcecd5933> in <listcomp>(.0)
15 for species, group in groupby(irises, lambda i: i[4]):
16 categorised_irises = list(group)
---> 17 sepal_lengths = [float(irises[0]) for iris in categorised_irises]
18 sepal_widths = [float(irises[1]) for iris in categorised_irises]
19 plt.scatter(sepal_lengths, sepal_widths, s=10, c=colors[species], label=species)
TypeError: float() argument must be a string or a number, not 'list'
1 Answer
Jennifer Nordell
Treehouse TeacherHi there, Jonathan Grieve! It seems like you have a typo. The variable irises
is a list which contains other lists. The variable you're looking for is iris
.
You wrote:
sepal_lengths = [float(irises[0]) for iris in categorised_irises]
But I believe that should be:
sepal_lengths = [float(iris[0]) for iris in categorised_irises]
Hope this helps!
Jonathan Grieve
Treehouse Moderator 91,253 PointsJonathan Grieve
Treehouse Moderator 91,253 PointsThanks for your help with this. It's truly amazing what I don't see sometimes when I'm coding! :)
Mark Chesney
11,747 PointsMark Chesney
11,747 PointsHi Jennifer, if you have any clues as to my similar but different ValueError, they would be gladly appreciated!