python之列表推导式的用法

# 构建一个1-100的列表
l1 = [i for i in range(1,101)]
print(l1)

# 输出结果
[1,2,3,4,5,6,...100]

print([i for i in range(1,11)])
# 输出结果
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

print([i**2 for i in range(1, 11)])

print([i for i in range(2, 101, 2)])

print([f'python{i}期' for i in range(1, 101)])

l1 = [i*i for i in range(1,11)]
print(l1)

l2 = [i for i in range(1,101) if i % 2 == 0]
print(l2)

l3 = [f'python{i}期' for i in range(1,101)]

print(l3)

# 构建一个列表,要求元素大于4
print([i for i in range(11) if i > 4])

# 输出结果:
[5, 6, 7, 8, 9, 10]

# print([i for i in range(11) if i > 4])
print([i for i in range(1,31) if i % 3 == 0])

# 过滤掉长度小于3的字符串列表，并将剩下的转换成大写字母
l1 = ['太白金星', 'fdsaf', 'alex', 'sb', 'ab']

l2 = [i.upper() for i in l1 if len(i) > 3]
print(l2)

names = [['Tom', 'Billy', 'Jefferson', 'Andrew', 'Wesley', 'Steven', 'Joe'],
     ['Alice', 'Jill', 'Ana', 'Wendy', 'Jennifer', 'Sherry', 'Eva']]
# 方法一: 普通方法
l4 = []
for i in names:
  for j in i:
    if j.count('e') >= 2:
      l4.append(j)
print(l4)

# 方法二: 列表推导式方法
print([j for i in names for j in i if j.count('e') >= 2 ])