[英]Using Pandas to_csv function
I have been experimenting with pandas, and while I have figured out how to use it to read data, I have stumbled upon some trouble in writing my output, and need your help! 我一直在尝试熊猫,虽然我想出了如何使用它来读取数据,但偶然发现在编写输出时遇到了一些麻烦,需要您的帮助!
This is my simplified code: 这是我的简化代码:
import pandas as pd
df = pd.DataFrame("prices", "product1", "product2", "product3")
prices = df.prices
product1 = df.product1
product2 = df.product2
product3 = df.product3
prices = ["Price Option 1", "Price Option 2", "Price Option 3"]
product1 = [1,2,3]
product2 = [4,5,6]
product3 = [7,8,9]
df.to_csv("output.csv")
The expected output was supposed to be something like: 预期的输出应该是这样的:
prices product1 product2 product3
price1 1 2 3
price2 4 5 6
price3 7 8 9
But instead I get this error: 但是相反我得到了这个错误:
Traceback (most recent call last):
File "output.py", line 3, in <module>
df = pd.DataFrame("prices", "product1", "product2", "product3")
File "C:\Python27\lib\site-packages\pandas-0.14.1-py2.7-win32.egg\pandas\core\frame.py", line 194,
in __init__
dtype = self._validate_dtype(dtype)
File "C:\Python27\lib\site-packages\pandas-0.14.1-py2.7-win32.egg\pandas\core\generic.py", line 10
8, in _validate_dtype
dtype = np.dtype(dtype)
TypeError: data type "product3" not understood
And I'm not quite sure why... Help is much appreciated! 而且我不太确定为什么...非常感谢您的帮助!
You are constructing your df incorrectly, the following would work: 您错误地构建了df,以下方法将起作用:
In [3]:
df = pd.DataFrame(columns=["prices", "product1", "product2", "product3"])
df.prices = ["Price Option 1", "Price Option 2", "Price Option 3"]
df.product1 = [1,2,3]
df.product2 = [4,5,6]
df.product3 = [7,8,9]
df
Out[3]:
prices product1 product2 product3
0 Price Option 1 1 4 7
1 Price Option 2 2 5 8
2 Price Option 3 3 6 9
As would putting your data into a dict: 就像将数据放入字典一样:
In [4]:
data = {'prices':["Price Option 1", "Price Option 2", "Price Option 3"], 'product1':[1,2,3], 'product2':[4,5,6], 'product3':[7,8,9]}
pd.DataFrame(data)
Out[4]:
prices product1 product2 product3
0 Price Option 1 1 4 7
1 Price Option 2 2 5 8
2 Price Option 3 3 6 9
You can then write to csv as normal 然后您可以照常写入csv
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