Python的移调数据与观察

Question

我有一个问题，

我最初df是这样的：

Col 1 Col 2 Col 3 

laura purchase 1 dress23 

laura puchase 2 skirt55 

laura purchase 3 shirt47 

laura purchase 4 coat45 

julia puchase 1 skirt74 

julia purchase 2 short74 

julia purchase 3 coat14 

julia purchase 4 coat15 

---

---

，我想获得它使用库熊猫

Col 1 Purchase 1 Purchase 2 Purchase 3 Purchase 4 
Laura dresse23 skirt55  shirt47  coat45 
Julia skirt74 short74  coat14  coast10 

请问，你能帮助我吗？

这将是非常好的，

谢谢你，

ň

Answer 1

鉴于数据：

col 1  col 2 col 3 
0 laura purchase 1 dress23 
1 laura purchase 2 skirt55 
2 laura purchase 3 shirt47 
3 laura purchase 4 coat45 
4 julia purchase 1 skirt74 
5 julia purchase 2 short74 
6 julia purchase 3 coat14 
7 julia purchase 4 coat15 

转型：

df = df.pivot(index='col 1', columns='col 2', values='col 3').reset_index() 
df = df.rename(columns={'col 1': 'name'}) 
df.columns.name = 'id' 
print(df) 

结果：

id name purchase 1 purchase 2 purchase 3 purchase 4 
0 julia skirt74 short74  coat14  coat15 
1 laura dress23 skirt55 shirt47  coat45 

Answer 2

1.方法set_index，堆栈，reset_index

使用​​，unstack和reset_index：

df.set_index(['Col 1','Col 2'])['Col 3'].unstack().reset_index() 

输出：

Col 2 Col 1 puchase 1 puchase 2 purchase 1 purchase 2 purchase 3 purchase 4 
0  julia skirt74  None  None short74  coat14  coat15 
1  laura  None skirt55 dress23  None shirt47  coat45 

先做一个小数据清理和你结果看起来像。 新的输入DF，

Col 1  Col 2 Col 3 
0 laura purchase 1 dress23 
1 laura purchase 2 skirt55 
2 laura purchase 3 shirt47 
3 laura purchase 4 coat45 
4 julia purchase 1 skirt74 
5 julia purchase 2 short74 
6 julia purchase 3 coat14 
7 julia purchase 4 coat15 

现在，执行大熊猫重塑：

df.set_index(['Col 1','Col 2'])['Col 3'].unstack().reset_index() 

输出：

Col 2 Col 1 purchase 1 purchase 2 purchase 3 purchase 4 
0  julia skirt74 short74  coat14  coat15 
1  laura dress23 skirt55 shirt47  coat45 

2.方法支点和reset_index

或者使用pivot和reset_index：

df.pivot(index='Col 1',columns = 'Col 2', values= 'Col 3').reset_index() 

输出：

Col 2 Col 1 purchase 1 purchase 2 purchase 3 purchase 4 
0  julia skirt74 short74  coat14  coat15 
1  laura dress23 skirt55 shirt47  coat45