In [3]:

    

import numpy as np


    

In [5]:

    

from numpy import pi


    

In [7]:

    

from numpy import *


    

In [8]:

    

import numpy.linalg as la


    

In [2]:

    

numpy.pi


    

    
Out[2]:





3.141592653589793

In [4]:

    

np.pi


    

    
Out[4]:





3.141592653589793

In [6]:

    

pi


    

    
Out[6]:





3.141592653589793

In [23]:

    

%%file foo.py
def bar():
    print('hi')
    
if __name__ == '__main__':
    bar()


    

    




Overwriting foo.py

In [10]:

    

! ls


    

    




foo.py	Lecture01.ipynb  Lecture02.ipynb  Lecture03.ipynb

In [11]:

    

import foo


    

In [13]:

    

foo.bar()


    

    




hi

In [14]:

    

from foo import bar


    

In [15]:

    

bar()


    

    




hi

In [17]:

    

! python foo.py


    

    




hi

In [18]:

    

f = open('foo.py', 'r')
print(f.read())
f.close()


    

    




def bar():
    print('hi')
    
if __name__ == '__main__':
    bar()

In [20]:

    

with open('foo.py', 'r') as f:
    print(f.read())


    

    




def bar():
    print('hi')
    
if __name__ == '__main__':
    bar()

In [24]:

    

with open('foo.py', 'r') as f:
    lines = f.readlines()


    

In [25]:

    

lines


    

    
Out[25]:





['def bar():\n',
 "    print('hi')\n",
 '    \n',
 "if __name__ == '__main__':\n",
 '    bar()']

In [26]:

    

line = lines[0]


    

In [27]:

    

line


    

    
Out[27]:





'def bar():\n'

In [30]:

    

line = line.strip()


    

In [31]:

    

line


    

    
Out[31]:





'def bar():'

In [32]:

    

line.lower()


    

    
Out[32]:





'def bar():'

In [33]:

    

line.upper()


    

    
Out[33]:





'DEF BAR():'

In [34]:

    

line.title()


    

    
Out[34]:





'Def Bar():'

In [35]:

    

lines


    

    
Out[35]:





['def bar():\n',
 "    print('hi')\n",
 '    \n',
 "if __name__ == '__main__':\n",
 '    bar()']

In [36]:

    

''.join(lines)


    

    
Out[36]:





"def bar():\n    print('hi')\n    \nif __name__ == '__main__':\n    bar()"

In [37]:

    

'XXX'.join(lines)


    

    
Out[37]:





"def bar():\nXXX    print('hi')\nXXX    \nXXXif __name__ == '__main__':\nXXX    bar()"

In [39]:

    

fubar = '-'.join(['foo', 'bar', 'baz'])


    

In [40]:

    

fubar


    

    
Out[40]:





'foo-bar-baz'

In [41]:

    

fubar.split('-')


    

    
Out[41]:





['foo', 'bar', 'baz']

In [43]:

    

s = ''.join(lines)
s.split()


    

    
Out[43]:





['def',
 'bar():',
 "print('hi')",
 'if',
 '__name__',
 '==',
 "'__main__':",
 'bar()']

In [47]:

    

from string import punctuation


    

In [48]:

    

punctuation


    

    
Out[48]:





'!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~'

In [51]:

    

s = ''.join(lines)


    

In [52]:

    

s


    

    
Out[52]:





"def bar():\n    print('hi')\n    \nif __name__ == '__main__':\n    bar()"

In [53]:

    

for char in punctuation:
    s = s.replace(char, '')


    

In [54]:

    

s


    

    
Out[54]:





'def bar\n    printhi\n    \nif name  main\n    bar'

In [55]:

    

s = ''.join(lines)


    

In [56]:

    

table = dict.fromkeys(map(ord, punctuation))


    

In [58]:

    

s


    

    
Out[58]:





"def bar():\n    print('hi')\n    \nif __name__ == '__main__':\n    bar()"

In [59]:

    

s.translate(table)


    

    
Out[59]:





'def bar\n    printhi\n    \nif name  main\n    bar'

In [62]:

    

s


    

    
Out[62]:





"def bar():\n    print('hi')\n    \nif __name__ == '__main__':\n    bar()"

In [63]:

    

s[5:10]


    

    
Out[63]:





'ar():'

In [65]:

    

s.find('bar')


    

    
Out[65]:





4

In [66]:

    

s.rfind('bar')


    

    
Out[66]:





63

In [ ]: