python 1 入门至字符串

#input
#name = input('input your name')
#print(name)

#numpy
import numpy as np
x = np.arange(0,2*np.pi,0.01)
y = np.sin(x)
print(y)

#docstring
say = '''Tom: "let's go!"
jerry:"ok!"'''
print(say)
print(say[-1])

#切片
age = '1234567'
a = age[0::2]
print(a)

#拼接＋重复
a = (a+".")*3
print(a)

#分割和拼接
ip = "192.168.1.123"
lb1 = ip.split('.')
print(lb1)
new_ip = " * ".join(lb1)
print(new_ip)

#字符串格式化
msg = "hello %s, your age is %d."
print(msg)
print(msg % ('dd',24))

hero = "name : %10s age : %6d"
dd = ('dd',24)
xx = ('xx',15)
print(hero%dd)
print(hero%xx)