[英]How to extract from dictionaries to only print certain variables python
I had a tsv file like such我有一个像这样的 tsv 文件
Name School Course
Nicole UVA Biology
Jenna GWU CS
from there, I only want to print the Name and the Course from that dictionary.从那里,我只想打印该字典中的名称和课程。 How would I go about this?
我该怎么办?
The code below is how I put the original TSV file into the dictionary above.下面的代码是我如何将原始 TSV 文件放入上面的字典中。
import csv
data = csv.reader(open('data.tsv'),delimiter='\t')
fields = data.next()
for row in data:
item = dict(zip(fields, row))
print item
So now I got a dictionary like such:所以现在我得到了这样的字典:
{'Name':'Nicole.', 'School':'UVA.','Course':'Biology'}
{'Name':'Jenna.', 'School':'GWU','Course':'CS'}
{'Name':'Shan', 'School':'Columbia','Course':'Astronomy'}
{'Name':'BILL', 'School':'UMD.','Course':'Algebra'}
I only want to print the Name and the Course from that dictionary.我只想打印该字典中的名称和课程。 How would I go about this?
我该怎么办?
I want to add code so that I'm only printing我想添加代码以便我只打印
{'Name':'Jenna.','Course':'CS'}
{'Name':'Shan','Course':'Astronomy'}
{'Name':'BILL','Course':'Algebra'}
Please guide.请指导。 Thank You
谢谢你
Just delete the key in the loop 只需删除循环中的密钥
for row in data:
item = dict(zip(fields, row))
del item['School']
print item
The easiest way is to just remove the item['School']
entry before printing 最简单的方法是在打印之前删除
item['School']
条目
for row in data:
item = dict(zip(fields, row))
del item['School']
print item
But this only works if you know exactly what the dictionary looks like, it has no other entries that you don't want, and it already has a School
entry. 但这仅在您完全知道词典的外观,没有其他不需要的条目并且已经有
School
条目的情况下才有效。 I would instead recommend that you build a new dictionary out of the old one, only keeping the Name
and Course
entries 相反,我建议您在旧词典的基础上再建一个新词典,只保留
Name
和Course
条目
for row in data:
item = dict(zip(fields, row))
item = {k, v for k, v in item.items() if k in ('Name', 'Course')}
print item
Maybe use a DictReader
in the first place, and rebuild the row-dict only if key matches a pre-defined list: 也许首先使用
DictReader
,并且仅在键与预定义列表匹配时才重新DictReader
行字典:
import csv
keep = {"Name","Course"}
data = csv.DictReader(open('data.tsv'),delimiter='\t')
for row in data:
row = {k:v for k,v in row.items() if k in keep}
print(row)
result: 结果:
{'Course': 'Biology', 'Name': 'Nicole'}
{'Course': 'CS', 'Name': 'Jenna'}
根据这里的答案: 过滤python字典中的项,其中键包含特定的字符串
print {k:v for k,v in item.iteritems() if "Name" in k or "Course" in k}
You're better off using a library designed for these kinds of tasks (Pandas). 最好使用专为此类任务(熊猫)设计的库。 A dictionary is great for storing key-value pairs, but it looks like you have spreadsheet-like tabular data, so you should choose a storage type that better reflects the data at hand.
字典非常适合存储键值对,但是看起来您具有类似电子表格的表格数据,因此您应该选择一种存储类型,以更好地反映手头的数据。 You could simply do the following:
您可以简单地执行以下操作:
import pandas as pd
df = pd.read_csv('myFile.csv', sep = '\t')
print df[['Name','Course']]
You'll find that as you start doing more complicated tasks, it's better to use well written libraries than to cludge something together 您会发现,当您开始执行更复杂的任务时,最好使用编写良好的库而不是将某些东西组合在一起
replace the your " print(item) " line with the below line.用下面的行替换你的“print(item)”行。
print(dict(filter(lambda e: e[0]!='School', item)))
OUTPUT:输出:
{'Name':'Jenna.','Course':'CS'}
{'Name':'Shan','Course':'Astronomy'}
{'Name':'BILL','Course':'Algebra'}
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