Python 数组

arr = ['a','b','c']
arr.append('d')
print(arr)

for each in arr:
  print(each)

# 原文：
#http://c.biancheng.net/view/2209.html
#https://blog.****.net/qq_19741181/article/details/79827963

# python的区间是前闭后开，索引还是从0开始
lang = ["Python", "C++", "Java", "PHP", "Ruby", "MATLAB"]

arr=lang[1:4:1]
print(arr)

del lang[1: 4]
print(lang)

import numpy as np

arr=[]
arr.append((0, 1))

# 元素不在数组中
if (0,11) not in arr:
    print(111)

# 元素在数组中
if (0,1) in arr:
    print(222)
    
print(arr)

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