Python 将两列合并到另一个数据帧列

我想基于班列将两列合并到另一个数据帧

df1

    Squad
0   Arsenal
1   Aston Villa
2   Bournemouth
3   Brighton
4   Burnley
5   Chelsea
6   Crystal Palace
7   Everton
8   Leicester City
9   Liverpool
10  Manchester City
11  Manchester Utd
12  Newcastle Utd
13  Norwich City
14  Sheffield Utd
15  Southampton
16  Tottenham
17  Watford
18  West Ham
19  Wolves

df2

    Rk  Squad   MP  W   D   L   GF  GA  GD  Pts ... L   GF  GA  GD  Pts Pts/G   xG  xGA xGD xGD/90
0   1   Liverpool   19  18  1   0   52  16  36  55  ... 3   33  17  16  44  2.32    31.2    21.6    9.5 0.50
1   2   Manchester City 19  15  2   2   57  13  44  47  ... 7   45  22  23  34  1.79    45.5    19.5    26.0    1.37
2   3   Manchester Utd  19  10  7   2   40  17  23  37  ... 6   26  19  7   29  1.53    28.4    21.1    7.4 0.39
3   4   Chelsea 19  11  3   5   30  16  14  36  ... 7   39  38  1   30  1.58    29.2    27.2    2.0 0.10
4   5   Leicester City  19  11  4   4   35  17  18  37  ... 8   32  24  8   25  1.32    31.0    22.7    8.3 0.44
5   6   Tottenham   19  12  3   4   36  17  19  39  ... 7   25  30  -5  20  1.05    21.6    28.7    -7.1    -0.37
6   7   Wolves  19  8   7   4   27  19  8   31  ... 5   24  21  3   28  1.47    21.2    18.3    2.9 0.15
7   8   Arsenal 19  10  6   3   36  24  12  36  ... 7   20  24  -4  20  1.05    22.0    25.8    -3.8    -0.20
8   9   Sheffield Utd   19  10  3   6   24  15  9   33  ... 6   15  24  -9  21  1.11    15.3    28.2    -12.9   -0.68
9   10  Burnley 19  8   4   7   24  23  1   28  ... 7   19  27  -8  26  1.37    16.6    27.1    -10.4   -0.55
10  11  Southampton 19  6   3   10  21  35  -14 21  ... 6   30  25  5   31  1.63    30.8    24.9    5.9 0.31
11  12  Everton 19  8   7   4   24  21  3   31  ... 11  20  35  -15 18  0.95    21.8    24.9    -3.1    -0.16
12  13  Newcastle Utd   19  6   8   5   20  21  -1  26  ... 11  18  37  -19 18  0.95    15.0    30.3    -15.3   -0.81
13  14  Crystal Palace  19  6   5   8   15  20  -5  23  ... 9   16  30  -14 20  1.05    16.4    31.6    -15.2   -0.80
14  15  Brighton    19  5   7   7   20  27  -7  22  ... 8   19  27  -8  19  1.00    20.3    28.5    -8.2    -0.43
15  16  West Ham    19  6   4   9   30  33  -3  22  ... 10  19  29  -10 17  0.89    22.5    31.9    -9.4    -0.49
16  17  Aston Villa 19  7   3   9   22  30  -8  24  ... 12  19  37  -18 11  0.58    18.5    34.5    -16.0   -0.84
17  18  Bournemouth 19  5   6   8   22  30  -8  21  ... 14  18  35  -17 13  0.68    20.4    32.3    -11.9   -0.63
18  19  Watford 19  6   6   7   22  27  -5  24  ... 13  14  37  -23 10  0.53    18.5    29.9    -11.4   -0.60
19  20  Norwich City    19  4   3   12  19  37  -18 15  ... 15  7   38  -31 6   0.32    17.7    30.2    -12.6   -0.66

我想在df1上创建一个新列，并进行计算，即W列的值除以MP列的值。 我试图将W列合并到df1，但得到了

TypeError:无法将bool转换为numpy.ndarray

df1 = pd.merge(df1, df2['Squad','W'], on='Squad',how='left')

尝试：

---

注意：

请确保在分割之前处理

NAN和0

。

df2['squand'，'W']

应该是

df2[[['squand'，'W']]

或者你是说别的什么？

result = df1.merge(df2[['Squad','W', 'MP']], how='left')
result['new_col'] = result['W'] / result['MP']