with open('/tmp/oil.csv', 'w') as f:
  for l in oil(url):
  f.write(l + '\n')

o = oil(url)
ls = list(o)
s = '\n'.join(ls)
import pandas as pd
import io
# we will cover StringIO next week - kind of an 'in-memory' file
df = pd.read_csv(io.StringIO(s))
df

• to write f2c, we solved the equation for C, and made a function out of the other side of the equation
• to write c2f, we solved for F, . . .
• there is another way to think about this
• rearrange the equation into a symmetric form 9 * C – 5 * F = -32 * 5
• you can think of the equation above as a “constraint” between F and C. if you specify one variable, the other’s value is determined by the equation. in general, if we have c0 * x0 + c1 * x1 + … cN * xN = total
• cI are fixed coefficients
• specifying any N of the (N + 1) x’s will determine the remaining x variable
• define a class, ‘Constaint’ that will do ‘constraint satisfaction’
• you may find ‘dotnone’ to be helpful

Problem 3 – Hamlet

• Python is very popular in ‘digital humanities’
• MIT has the complete works of Shakespeare in a simple html format
• You will do a simple analysis of Hamlet by reading the html file, one line at a time(usual iteration scheme) and doing pattern matching
• The goal is to return a list of the linecnt, total number of ‘speeches’(look at the file format), and a dict showing the number of ‘speeches’ each character gives
• Your program should read directly from the url given, but you may want to download a copy to examine the structure of the file.
• remember that usrlib.request returns ‘byte arrays’, not strings
• here’s a short sample of the file

Problem 4

• in class, we discussed two different ways to represent a polynomial
  • polylist, a ‘dense’ represenation, that hold the coefficients in a list
  • polydict, a ‘sparse’ representation, that holds (exponent, coefficent) pairs in a dict
• add a method, ‘topolydict()’ to class ‘polylist’, that converts the polylist into a polydict
• add a method, ‘topolylist()’ to class ‘polydict’, that converts the polydict into a polylist
• note that polylist->polydict will always work, but polydict->polylist can fail, because a polylist cannot represent negative exponents. in this case, raise a ValueError
• just to tell them apart, polylist prints with a leading ‘+’

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在此对LE PHUONG对本文所作的贡献表示诚挚感谢，她在山东大学完成了计算机科学与技术专业的硕士学位，专注数据分析、数据可视化、数据采集等。擅长Python、SQL、C/C++、HTML、CSS、VSCode、Linux、Jupyter Notebook。