标签：turn 必须 collect inf 过滤 container python app highlight
1、集合的推导式
语法：[exp for item in collection if codition]
if codition - 可选
语法：{key_exp：value_exp for item in collection if codition}
语法：{exp for item in collection if codition}
2、多函数模式
函数列表，python中一切皆对象。
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# 处理字符串str_lst = [‘$1.123‘, ‘ $1123.454‘, ‘$899.12312‘]def remove_space(str): """ remove space """ str_no_space = str.replace(‘ ‘, ‘‘) return str_no_spacedef remove_dollar(str): """ remove $ """ if ‘$‘ in str: return str.replace(‘$‘, ‘‘) else: return strdef clean_str_lst(str_lst, operations): """ clean string list """ result = [] for item in str_lst: for op in operations: item = op(item) result.append(item) return resultclean_operations = [remove_space, remove_dollar]result = clean_str_lst(str_lst, clean_operations)print result |
执行结果：[‘1.123‘, ‘1123.454‘, ‘899.12312‘]
3、匿名函数lambda
1、函数式编程
2、map/reduce函数
lst = [a1, a2 ,a3, ......, an]
reduce(func(x,y), lst) = func(func(func(a1, a2), a3), ......, an)
3、filter函数
标签：turn 必须 collect inf 过滤 container python app highlight
原文地址：https://www.cnblogs.com/chengjian-physique/p/11909297.html
