[英]Creating DataFrame from dictionary with different lengths of values
因此,我希望從類似於以下內容的字典中創建 DataFrame:
d = {A: ['cat','dog','zebra'],
B: ['frog,'lion'],
C: ['snake','cat','ant','bird','turtle'],
D: ['sloth']}
我希望 dataframe 看起來像這樣:
Col1 Col2 Col3 Col4 Col5 Col6
A 'cat' 'dog' 'zebra' na na
B 'frog' 'lion' na na na
C 'snake' 'cat' 'ant' 'bird' 'turtle'
D 'sloth' na na na na
有任何想法嗎? 謝謝你!
使用列表推導為嵌套列表添加字典鍵,傳遞給DataFrame
構造函數並添加DataFrame.add_prefix
:
df = pd.DataFrame([[k,] + v for k, v in d.items()]).add_prefix('Col')
print (df)
Col0 Col1 Col2 Col3 Col4 Col5
0 A cat dog zebra None None
1 B frog lion None None None
2 C snake cat ant bird turtle
3 D sloth None None None None
或者使用DataFrame.from_dict
將索引轉換為列,然后設置新的列名:
df = pd.DataFrame.from_dict(d, orient='index').reset_index()
df.columns = [f'col{x}' for x in range(1, len(df.columns) + 1)]
print (df)
col1 col2 col3 col4 col5 col6
0 A cat dog zebra None None
1 B frog lion None None None
2 C snake cat ant bird turtle
3 D sloth None None None None
如果想從col1
開始,可以使用自定義 function rename
:
f = lambda x: f'col{x+1}'
df = pd.DataFrame([[k,] + v for k, v in d.items()]).rename(columns=f)
print (df)
col1 col2 col3 col4 col5 col6
0 A cat dog zebra None None
1 B frog lion None None None
2 C snake cat ant bird turtle
3 D sloth None None None None
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