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ycchen00
GitHub Repository: ycchen00/Introduction-to-Data-Science-in-Python
 Path: blob/main/quiz/quiz1.ipynb
3223 views
Kernel: Python 3

Q1

%E5%9B%BE%E7%89%87.png

import re
string = 'bat, lat, mat, bet, let, met, bit, lit, mit, bot, lot, mot'
result = re.findall('b[ao]t', string)
print(result)
['bat', 'bot']

Q2

%E5%9B%BE%E7%89%87.png

import numpy as np
a=np.zeros((20,20))
b=np.ones((20,20))
def l2_dist(a, b):
     result = ((a - b) * (a - b)).sum()
     result = result ** 0.5
     return result

np.reshape(a,(20*20)).shape
(400,)
np.reshape(b,(20*20,1)).shape
(400, 1)
a=np.zeros((20,20))
b=np.ones((20,20))
l2_dist(np.reshape(a,(20*20)), np.reshape(b,(20*20,1)))
400.0
a=np.zeros((20,20))
b=np.ones((20,20))
l2_dist(np.reshape(a,(20*20)), np.reshape(b,(20*20)))
20.0
a=np.zeros((20,20))
b=np.ones((20,20))
l2_dist(a.T,b.T)
20.0
a=np.zeros((20,20))
b=np.ones((20,20))
l2_dist(a,b)
20.0

Q3

%E5%9B%BE%E7%89%87.png

a1 = np.random.rand(4)
a2 = np.random.rand(4, 1)
a3 = np.array([[1, 2, 3, 4]])
a4 = np.arange(1, 4, 1)
a5 = np.linspace(1 ,4, 4)

a5.shape==a1.shape
True
# a4.ndim()==1 
print("'int' object is not callable")
'int' object is not callable 
a3.shape==a4.shape
False
a1.shape==a2.shape
False

Q4

%E5%9B%BE%E7%89%87.png

import numpy as np

old = np.array([[1, 1, 1], [1, 1, 1]])
new = old
new[0, :2] = 0
print(old)
[[0 0 1] [1 1 1]]

Q5

%E5%9B%BE%E7%89%87.png

import numpy as np
r=np.ones((6,6))
r[2:4,2:4].shape
(2, 2)

Q6

%E5%9B%BE%E7%89%87.png

import re
s = 'ACBCAC'

re.findall('^AC',s)
['AC']

Q7

%E5%9B%BE%E7%89%87.png

import re

s = 'ACAABAACAAAB'
result = re.findall('A{1,2}', s)
L = len(result)
L
5
result
['A', 'AA', 'AA', 'AA', 'A']

Q8

%E5%9B%BE%E7%89%87.png

q8='Office of Research Administration: (734) 647-6333 | 4325 North Quad\
Office of Budget and Financial Administration: (734) 647-8044 | 309 Maynard, Suite 205\
Health Informatics Program: (734) 763-2285 | 333 Maynard, Suite 500\
Office of the Dean: (734) 647-3576 | 4322 North Quad\
UMSI Engagement Center: (734) 763-1251 | 777 North University\
Faculty Adminstrative Support Staff: (734) 764-9376 | 4322 North Quad'

pattern='[(]\d{3}[)]\s\d{3}[-]\d{4}'
# pattern='[(]\d{3}[)]\d{3}[-]\d{4}'
# pattern='\d{3}[-]\d{3}[-]\d{4}'
# pattern='\d{3}\s[-]\d{3}[-]\d{4}'
re.findall(pattern, q8)
['(734) 647-6333', '(734) 647-8044', '(734) 763-2285', '(734) 647-3576', '(734) 763-1251', '(734) 764-9376']

Q9

%E5%9B%BE%E7%89%87.png

q9='I refer to https://google.com and I never refer http://www.baidu.com if I have to search anything'

pattern='(?<=[https]:\/\/)([A-Za-z0-9.]*)'
# pattern='(?<=https:\/\/)([A-Za-z0-9]*)'
# pattern='(?<=https:\/\/)([A-Za-z0-9.]*)'
# pattern='(?<=https:\/\/)([.]*)'
re.findall(pattern, q9)
['google.com', 'www.baidu.com']

Q10

%E5%9B%BE%E7%89%87.png

text=r'''Everyone has the following fundamental freedoms:
(a) freedom of conscience and religion;
(b) freedom of thought, belief, opinion and expression, including freedom of the press and other media of communication;
(c) freedom of peaceful assembly; and
(d) freedom of association.
'''
import re

X='\(.\)'
# X='freedom'
# X='(.)'
# X='[a-d]'


pattern = X
print(len(re.findall(pattern,text)))
4