这是pandas文件的头部
In [19]: train.head()
Out[19]:
Unnamed: 0 id \
0 1 0a58358a2afd3e4e
1 2 6b2bb500b6a38aa0
2 3 b399f09dee9c3c67
3 4 19ace29d77a5be66
4 5 2c9c54b62f0a6a37
url landmark_id exists \
0 http://lh6.ggpht.com/-igpT6wu0mIA/ROV8HnUuABI/... 6651 True
1 http://lh6.ggpht.com/-vKr5G5MEusk/SR6r6SJi6mI/... 11284 True
2 https://lh3.googleusercontent.com/-LOW2cjAqubA... 8429 True
3 https://lh5.googleusercontent.com/-tnmSXwQcWL8... 6231 True
4 https://lh5.googleusercontent.com/-mEaSECO7D-4... 10400 True
filename
0 training_images/0a58358a2afd3e4e.jpg
1 training_images/6b2bb500b6a38aa0.jpg
2 training_images/b399f09dee9c3c67.jpg
3 training_images/19ace29d77a5be66.jpg
4 training_images/2c9c54b62f0a6a37.jpg
我要创建的是一个新的文件名行，其中包含landmark_id，因此我可以使用它来移动文件
In [23]: train['new_filename'] = 'training_images/' + train['landmark_id'] + '/' + train['id'] + '.jpg'
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-23-94fcfab9d25c> in <module>()
----> 1 train['new_filename'] = 'training_images/' + train['landmark_id'] + '/' + train['id'] + '.jpg'
/home/muiruri_samuel/.local/lib/python2.7/site-packages/pandas/core/ops.pyc in wrapper(left, right, name, na_op)
737 lvalues = lvalues.values
738
--> 739 result = wrap_results(safe_na_op(lvalues, rvalues))
740 return construct_result(
741 left,
/home/muiruri_samuel/.local/lib/python2.7/site-packages/pandas/core/ops.pyc in safe_na_op(lvalues, rvalues)
698 try:
699 with np.errstate(all='ignore'):
--> 700 return na_op(lvalues, rvalues)
701 except Exception:
702 if isinstance(rvalues, ABCSeries):
/home/muiruri_samuel/.local/lib/python2.7/site-packages/pandas/core/ops.pyc in na_op(x, y)
684 result = np.empty(len(x), dtype=x.dtype)
685 mask = notna(x)
--> 686 result[mask] = op(x[mask], y)
687 else:
688 raise TypeError("{typ} cannot perform the operation "
/home/muiruri_samuel/.local/lib/python2.7/site-packages/pandas/core/ops.pyc in <lambda>(x, y)
76 add=arith_method(operator.add, names('add'), op('+'),
77 default_axis=default_axis),
---> 78 radd=arith_method(lambda x, y: y + x, names('radd'), op('+'),
79 default_axis=default_axis),
80 sub=arith_method(operator.sub, names('sub'), op('-'),
TypeError: ufunc 'add' did not contain a loop with signature matching types dtype('S21') dtype('S21') dtype('S21')
连接错误，出错。