python_code list_2

>>> import math
>>> math.sin(0.5)
0.479425538604203
>>>
>>> import random
>>> x=random.random()
>>> n=random.randint(1,100)
>>> import numpy as np
>>> a = np.array((1,2,3,4))
>>> print(a)
[1 2 3 4]
>>> from math import sin
>>> sin(3)
0.1411200080598672
>>> from math import sin as f
>>> f(3)
0.1411200080598672
>>> from math import *
>>> sin(3)
0.1411200080598672
>>> gcd(36,18)
18
>>> def main():
if __name__ == '__main__':
print('This program is run directly.')
elif __name__ == 'hello':
print('This program is used as a module.')

>>> import hello
Traceback (most recent call last):
File "<pyshell#72>", line 1, in <module>
import hello
ImportError: No module named 'hello'
>>> alist = ['a','b','mpilgrim','z','example']
>>> a_list = []
>>> a_listt = list((3,4,7,9))
>>> a_listt
[3, 4, 7, 9]
>>> list(range(1,10,2))
[1, 3, 5, 7, 9]
>>> list('hello world')
['h', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd']
>>> list({3,7,5})
[3, 5, 7]
>>> list({'a':3,'b':4,'c':5})
['b', 'a', 'c']
>>> list({'a':3,'b':4,'c':5}.items())
[('b', 4), ('a', 3), ('c', 5)]
>>> x = list(range(10))
>>> x
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> x[0]
0
>>> x[1]
1
>>> x[-1]
9
>>> x[-2]
8
>>> x = [1,2,3,4,5,6]
>>> del x[0]
>>> x
[2, 3, 4, 5, 6]
>>> del x
>>> x
Traceback (most recent call last):
File "<pyshell#92>", line 1, in <module>
x
NameError: name 'x' is not defined
>>> x = {'a':3,'b':4,'c':5}
>>> del x['b']
>>> x
{'a': 3, 'c': 5}
>>> x1 = x['c']
>>> x1
5
>>>