8000 Merge pull request #15 from topleft/chap15 · coderwxy/book1-exercises@af9fc21 · GitHub
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Merge pull request realpython#15 from topleft/chap15
review exercises and rename
2 parents c3d717e + f4173a1 commit af9fc21

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‎refactor/chp15/practice_files/pirates.csv

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Year,Temperature,Pirates
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1820,14.25,45000
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1860,14.4,35000
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1880,14.55,20000
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1920,14.9,15000
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1940,15.25,5000
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1980,15.6,400
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2000,15.9,17

‎refactor/chp15/solutions/15-1.py

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# 15.1 review exercises
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# Setup
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import numpy
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# Create a 3x3 array of the number 3 through 11 using reshape()
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first_matrix = numpy.arange(3, 12)
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first_matrix = first_matrix.reshape(3, 3)
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# Display the min, max and mean of all entries in the matrix
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print "Min is", first_matrix.min()
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print "Max is", first_matrix.max()
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print "Mean is", first_matrix.mean()
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# Square every entry and save in a new matrix
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second_matrix = first_matrix ** 2
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# Put first_matrix on top of second_matrix
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third_matrix = numpy.vstack([first_matrix, second_matrix])
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# Calculate the dot product of third_matrix by first_matrix
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print(numpy.dot(third_matrix, first_matrix))
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# Reshape third_matrix into a 3x3x2 matrix
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third_matrix = third_matrix.reshape(3, 3, 2)
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print(third_matrix)

‎refactor/chp15/solutions/pirates.py

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# 15.2 pirates.py
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# Graph pirates versus global warming
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from matplotlib import pyplot as plt
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import csv
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import os
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path = "C:/Real Python/refactor/chp15/practice_files"
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years = []
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temperatures = []
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pirates = []
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with open(os.path.join(path, "pirates.csv"), "rb") as my_file:
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my_file_reader = csv.reader(my_file)
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my_file_reader.next() # skip header row
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for year, temperature, pirate_count in my_file_reader:
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years.append(year)
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temperatures.append(temperature)
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pirates.append(pirate_count)
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plt.plot(pirates, temperatures, "r-o")
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# label graph
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plt.title("Global temperature as a function of pirate population")
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plt.xlabel("Total pirates")
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plt.ylabel("Average global temperature (Celsius)")
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plt.axis([-300, 48000, 14, 16])
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# annotate points with years
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for i in range(0, len(years)):
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plt.annotate(str(years[i]), xy=(pirates[i], temperatures[i]))
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# save and display graph
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plt.savefig(os.path.join(path, "Output/pirates.png"))
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plt.show()

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