如何在python中进行子分类? [英] How to do sub-sorting in python?

问题描述

非常感谢SO社区帮助我解决了之前遇到的问题.喜欢这里的帮助！

Many thanks to the SO community for helping me with the previous problems I had encountered. Love the help here!

我现在还有另一个问题.我有一个简单的DNA序列列表，其中关联了构造编号"和零件编号".就目前情况而言，从我之前的代码来看，我将其作为csv文件打开，读入并导入为csv文件.字典对象的列表.所有内容都已经按构造编号"进行了排序，但是我需要再按部件号"进行排序.(有点像在Excel中，他们说首先按 排序，然后按 _ 进行排序."

I have yet another problem now. I have a flat list of DNA sequences that have associated "Construct Number" and "Part Number. As things stand right now, from my previous code, I have it as a csv file which I open up, read in, and import as a list of dictionary objects. Everything is sorted by "Construct Number" already, but I need to then sort by "Part Number". (It's sort of like in Excel, where they say "First sort by and then sort by _."

有人知道如何做到这一点吗?到目前为止，我只写了这样的东西:

Does anybody know how to get this done? Thus far, all I have written is this:

primers_list = open('primers-list.csv', 'rU')
primers_unsorted = csv.DictReader(primers_list)
for row in primers_unsorted:
    print(row)

到目前为止，输出的一个子集如下，用于可视化我正在使用的数据:

A subset of the output thus far is just the following, for visualization of the data I'm working with:

{' Direction': 'fw primer', ' Construct Number': '1', ' Part Number': '2', 'Primer Sequence': 'AAGCGGCCGCTCGAGTCTAAgctcactcaaaggcggtaatcagataaaaaaaatccttag'}
{' Direction': 're primer', ' Construct Number': '1', ' Part Number': '1', 'Primer Sequence': 'attaccgcctttgagtgagcTTAGACTCGAGCGGCCGCTTTTTGACACCAGACCAACTGG'}
{' Direction': 'fw primer', ' Construct Number': '1', ' Part Number': '1', 'Primer Sequence': 'TTTAATTACTAACTTTATCTATGATAGATCCCGTCGTTTTACAACGTCGTGACTGGGAAA'}
{' Direction': 're primer', ' Construct Number': '1', ' Part Number': '2', 'Primer Sequence': 'AAAACGACGGGATCTATCATAGATAAAGTTAGTAATTAAACTTAAAAGTTGTTTAATGTC'}
{' Direction': 'fw primer', ' Construct Number': '2', ' Part Number': '2', 'Primer Sequence': 'gtaaatccaagttgtaataatactagagTAGCATAACCCCTTGGGGCCTCTAAACGGGTC'}
{' Direction': 're primer', ' Construct Number': '2', ' Part Number': '1', 'Primer Sequence': 'GGGGTTATGCTActctagtattattacaacttggatttaccacctttcttcgccttgatc'}
{' Direction': 'fw primer', ' Construct Number': '2', ' Part Number': '1', 'Primer Sequence': 'TACGACTCACTATAGGGAGAtactagagttaaggaggtaaaaaaaatgggtccggtcgtt'}
{' Direction': 're primer', ' Construct Number': '2', ' Part Number': '2', 'Primer Sequence': 'ttacctccttaactctagtaTCTCCCTATAGTGAGTCGTATTACTCTAGAAGCGGCCGCg'}
{' Direction': 'fw primer', ' Construct Number': '3', ' Part Number': '2', 'Primer Sequence': 'gtaaatccaagttgtaataatactagagTAGCATAACCCCTTGGGGCCTCTAAACGGGTC'}
{' Direction': 're primer', ' Construct Number': '3', ' Part Number': '1', 'Primer Sequence': 'GGGGTTATGCTActctagtattattacaacttggatttaccacctttcttcgccttgatc'}
{' Direction': 'fw primer', ' Construct Number': '3', ' Part Number': '1', 'Primer Sequence': 'TAACTATCACTATAGGGAGAtactagagttaaggaggtaaaaaaaatgggtccggtcgtt'}
{' Direction': 're primer', ' Construct Number': '3', ' Part Number': '2', 'Primer Sequence': 'ttacctccttaactctagtaTCTCCCTATAGTGATAGTTATTACTCTAGAAGCGGCCGCg'}

推荐答案

另一种方式:

import operator
primers_unsorted.sort(key=operator.itemgetter(' Construct Number', ' Part Number'))

for row in primers_unsorted:
    print(row)

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