Python列表数据过滤的不同方法汇总

"""
皮蛋编程(https://www.pidancode.com)
创建日期：2022/4/27
功能描述：Python列表数据过滤的不同方法汇总
"""

mylist = [1, 4, -5, 10, -7, 2, 3, -1]

# 所有正值
pos = [n for n in mylist if n > 0]
print(pos)

# 所有负值
neg = [n for n in mylist if n < 0]
print(neg)

# 将负值设置为0
neg_clip = [n if n > 0 else 0 for n in mylist]
print(neg_clip)

# 将正值设置为0
pos_clip = [n if n < 0 else 0 for n in mylist]
print(pos_clip)

# 压缩演示

addresses = [
    '5412 N CLARK',
    '5148 N CLARK',
    '5800 E 58TH',
    '2122 N CLARK',
    '5645 N RAVENSWOOD',
    '1060 W ADDISON',
    '4801 N BROADWAY',
    '1039 W GRANVILLE',
]

counts = [ 0, 3, 10, 4, 1, 7, 6, 1]

from itertools import compress

more5 = [ n > 5 for n in counts ]
a = list(compress(addresses, more5))
print(a)

[1, 4, 10, 2, 3]
[-5, -7, -1]
[1, 4, 0, 10, 0, 2, 3, 0]
[0, 0, -5, 0, -7, 0, 0, -1]
['5800 E 58TH', '1060 W ADDISON', '4801 N BROADWAY']