[英]Python: Write dictionary to text file with ordered columns
我有字典D,其中:
D = {'foo':{'meow':1.23,'mix':2.34}, 'bar':{'meow':4.56, 'mix':None}, 'baz':{'meow':None,'mix':None}}
我編寫了以下代碼以將其寫入文本文件:
def dict2txt(D, writefile, column1='-', delim='\t', width=20, order=['mix','meow']):
import csv
with open( writefile, 'w' ) as f:
writer, w = csv.writer(f, delimiter=delim), []
head = ['{!s:{}}'.format(column1,width)]
for i in D[D.keys()[0]].keys(): head.append('{!s:{}}'.format(i,width))
writer.writerow(head)
for i in D.keys():
row = ['{!s:{}}'.format(i,width)]
for k in order: row.append('{!s:{}}'.format(D[i][k],width))
writer.writerow(row)
但是輸出忽略order = ['mix','meow']
並將文件寫入如下:
- meow mix
bar None 4.56
foo 2.34 1.23456
baz None None
我如何寫:
- mix meow
bar 4.56 None
foo 1.23456 2.34
baz None None
謝謝!
更新:感謝@SukritKalra在下面的注釋中指出該代碼可以正常工作。 我只是沒有重新排序列標題!
for i in D[D.keys()[0]].keys(): head.append('{!s:{}}'.format(i,width))
應該for i in order: head.append('{!s:{}}'.format(i,width))
讀取for i in order: head.append('{!s:{}}'.format(i,width))
。 謝謝大家!
現在,使用精彩的Pandas庫,這是一種替代的,更輕松,更有效的方法
import pandas as pd
order=['mix', 'meow']
D = {'foo':{'meow':1.23,'mix':2.34}, 'bar':{'meow':4.56, 'mix':None}, 'baz':{'meow':None,'mix':None}}
df = pd.DataFrame(D).T.reindex(columns=order)
df.to_csv('./foo.txt', sep='\t', na_rep="none")
結果:
$ python test1.py
$ cat foo.txt
mix meow
bar none 4.56
baz none none
foo 2.34 1.23
利用您的“ order”變量來驅動一些發電機:
def dict2txt(D, writefile, column1='-', delim='\t', width=20, order=['mix','meow']):
import csv
# simplify formatting for clarity
fmt = lambda s: '{!s:{}}'.format(s, width)
with open(writefile, 'w') as f:
writer = csv.writer(f, delimiter=delim)
writer.writerow([fmt(column1)] + [fmt(s) for s in order])
for i in D.keys():
writer.writerow([fmt(i)] + [fmt(D[i][k]) for k in order])
這些行仍然是無序的。 因此,您可能想要類似:“ for sorted(D.keys())中的我:”
這是我從您的代碼中得出的:
def dict2txt(D, writefile, column1='-', delim='\t', width=20, order=['mix','meow']):
import csv
with open( writefile, 'w' ) as f:
writer, w = csv.writer(f, delimiter=delim), []
head = ['{!s:{}}'.format(column1,width)]
for i in order:
head.append('{!s:{}}'.format(i,width))
writer.writerow(head)
for i in sorted(D.keys()):
row = ['{!s:{}}'.format(i,width)]
for k in order: row.append('{!s:{}}'.format(D[i][k],width))
writer.writerow(row)
檔案內容:
- mix meow
bar None 4.56
baz None None
foo 2.34 1.23
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