Python Tasks & ML | Задачи по питону и машинному обучению

import re
s = "a x \n x a"
p1 = re.compile(r"a.*?a")
p2 = re.compile(r"a.*?a", re.DOTALL)
r1 = p1.findall(s)
r2 = p2.findall(s)
print(len(r1), len(r2))

import re
s = "<span>1</span><b>2</b>"
p1 = re.compile(r"(<\w+>.*</\w+>)")
p2 = re.compile(r"(<\w+>.*?</\w+>)")
x1 = p1.findall(s)
x2 = p2.findall(s)
print(len(x1), len(x2))

import re
expr = "a + A"
p = re.compile(r'a', flags=re.IGNORECASE)
g = lambda t, mt: t.upper() if mt.isupper() else t.lower()
f = lambda text: lambda m: g(text, m.group())
r = p.sub(f('b'), expr)
print(r)

import re
expr = 'x = 3; y = x**2; print(y)'
p = re.compile(r'\*\*(\d+)')
f = lambda m: f'^{int(m.group(1)) + 1}'
r = p.sub(f, expr)
exec(r)

import re
p = re.compile(r'(\d+)\*(\d+)')
expr = "2*3 + 4*5"
x, n = p.subn(r'\2 - \1', expr)
print(eval(x), n)

import re
p = re.compile(r'(\d+)\+(\d+)\-(\d+)')
expr = '2+10-5'
x = p.sub(r'\1*\2/\3', expr)
print(eval(x))

import re
d = "x\d"              
t = "xx97"

import re
d = re.compile('(\d+)/(\d+)')
text = '05/06 and 07/08'
x = d.match(text).group(0)
y = d.match(text).groups()[0]
print(x == y)

from sklearn.linear_model import LinearRegression
import numpy as np
y = np.array([0, 2, 4])
n = len(y)
X = np.arange(n).reshape((n, 1))
model = LinearRegression()
model.fit(X, y)
p = model.predict([[3], [4]])
print(*(round(x) for x in p))