python学习之 数组

s = "abcdefg"print("s[2:5]=", s[2:5])print("s[2:-2]=", s[2:-2])print("s[:]=", s[:])# s[2:5]= cde# s[2:-2]= cde# s[:]= abcdefgt1 = (1, 2, 3, 4)print(sum(t1))print(len(t1))print(max(t1))# 10# 4# 4print([i**2 for i in range(10)])print([(i, i**2) for i in range(10)])print([i for i in range(10) if i % 2 == 0])# [0, 1, 4, 9, 16, 25, 36, 49, 64, 81]# [(0, 0), (1, 1), (2, 4), (3, 9), (4, 16), (5, 25), (6, 36), (7, 49), (8, 64), (9, 81)]# [0, 2, 4, 6, 8]

二维数组：

a = []for i in range(100):    a.append([])    for j in range(100):        a[i].append(0)