后端开发|Python教程
Python,列表,转换,字典
后端开发-Python教程
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\[ {symbol: 101, sort: 1, ame: aaaa}, {symbol: 102, sort: 2, ame: bbb}, {symbol: 103, sort: 3, ame: cccc}, {symbol: 104, sort: 4, ame: dddd}, {symbol: 105, sort: 5, ame: eeee}, {symbol: 106, sort: 6, ame: ffff}, {symbol: 107, sort: 7, ame: gggg}, {symbol: 108, sort: 8, ame: hhhh}, {symbol: 109, sort: 9, ame: iiii}]转换成如下的结构，便于通过ID获取记录值{ 101: {sort: 1, symbol: 101, ame: aaaa}, 102: {sort: 2, symbol: 102, ame: bbb}, 103: {sort: 3, symbol: 103, ame: cccc}, 104: {sort: 4, symbol: 104, ame: dddd}, 105: {sort: 5, symbol: 105, ame: eeee}, 106: {sort: 6, symbol: 106, ame: ffff}, 107: {sort: 7, symbol: 107, ame: gggg}, 108: {sort: 8, symbol: 108, ame: hhhh}, 109: {sort: 9, symbol: 109, ame: iiii}}\students = [ {symbol: 101, sort: 1, ame: aaaa}, {symbol: 102, sort: 2, ame: bbb}, {symbol: 103, sort: 3, ame: cccc}, {symbol: 104, sort: 4, ame: dddd}, {symbol: 105, sort: 5, ame: eeee}, {symbol: 106, sort: 6, ame: ffff}, {symbol: 107, sort: 7, ame: gggg}, {symbol: 108, sort: 8, ame: hhhh}, {symbol: 109, sort: 9, ame: iiii} ]symbol_list = map(lambda x: (x.get(symbol), x), students)print symbol_listprint -----------------------------------------print dict(symbol_list)#value_list = map(lambda x: x, students)###print dict(zip(symbol_list, value_list))###student = {# 101: {symbol: 101, sort: 1, ame: aaaa}# }##student = [# {101: {symbol: 101, sort: 1, ame: aaaa}}# ]#
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students = [{ ame:zhangsan, price:20.01, date:-01-09T01:00:00Z},{ ame:lisi, price:10.01, date:-01-09T01:00:00Z},{ ame:wangwu, price:0.01, date:-01-09T01:00:00Z}] print sorted(students, key=lambda s:s["name"])print sorted(students, key=lambda s:s["price"], reverse=True)print sorted(students, key=lambda s:s["date"], reverse=True)aa = sorted(students, key=lambda s:s["price"], reverse=True)sorted(aa, key=lambda s:s["date"], reverse=True)symbol_arr = [, , ] sorted(symbol_arr, key=lambda s:s.amount, reverse=True)
