当我使用grep时Python：UnicodeEncodeError [英] Python : UnicodeEncodeError when I use grep

问题描述

我使用一个简单的python脚本来获取我CID的预订结果：
simple.py ：

$ p $ data = {minorRev：current minorRev＃，cid：xxx，apiKey：xxx， customerIpAddress：，creationDateStart：03/31/2013，}

url ='http：// someservice / services / rs /'
req = requests。 get（url，params = data）
print req
print req.text
print req.status_code


现在在命令提示符下，如果我执行 python simple.py ，它会完美运行并打印 req.text variable

然而，当我尝试执行

python simple.py | grep pattern code>

我得到

UnicodeEncodeError：'ascii'编解码器无法编码字符u'\ xe4'在pos ition 1314：序号不在范围内（128）


解决方案

print 需要在发送到stdout之前对字符串进行编码，但是当进程在管道中时， sys.stdout.encoding 是无，所以 print 收到 unicode 对象，然后尝试使用 ascii 编解码器对此对象进行编码 - 如果此 unicode


你可以解决这个问题，编码所有 unicode 对象 em>之前发送到标准输出（但您需要猜测使用哪个编解码器）。看看这些例子：
$ b

文件 wrong.py ：

 ＃coding：utf-8 
 
 print u'llvaro'
  

结果：



  alvaro @ ideas：/ tmp 
 $ python wrong.py 
Álvaro
 alvaro @ ideas：/ tmp 
 $ python wrong.py | grep a 
 Traceback（最近一次调用最后一次）：
文件wrong.py，第3行，位于< module> 
打印u'alvaro'
 UnicodeEncodeError：'ascii'编解码器无法在位置0编码字符u'\xc1'：序号不在范围内（128）
  

文件 right.py ：

 ＃编码：utf-8 
 
打印u'llvaro'.encode（'utf-8'）
＃unicode object encoded == Python 2中的`str` 
  

结果：



  alvaro @ ideas：/ tmp 
 $ python right.py 
Álvaro
 alvaro @ ideas：/ tmp 
 $ python right.py | grep a 
Álvaro
  




I am using a simple python script to get reservation results for my CID : simple.py:

data = {"minorRev":"current minorRev #","cid":"xxx","apiKey":"xxx","customerIpAddress":"  ","creationDateStart":"03/31/2013","}

url = 'http://someservice/services/rs/'                      
req = requests.get(url,params=data)                        
print req                                                                 
print req.text                                                                
print req.status_code

Now on the command prompt if I do python simple.py it runs perfectly and prints the req.text variable

However when I try to do
python simple.py | grep pattern

I get
UnicodeEncodeError: 'ascii' codec can't encode character u'\xe4' in position 1314: ordinal not in range(128)

解决方案

print needs to encode the string before sending to stdout but when the process is in a pipe, the value of sys.stdout.encoding is None, so print receives an unicode object and then it tries to encode this object using the ascii codec -- if you have non-ASCII characters in this unicode object, an exception will be raised.

You can solve this problem encoding all unicode objects before sending it to the standard output (but you'll need to guess which codec to use). See these examples:

File wrong.py:

# coding: utf-8

print u'Álvaro'

Result:

alvaro@ideas:/tmp
$ python wrong.py 
Álvaro
alvaro@ideas:/tmp
$ python wrong.py | grep a
Traceback (most recent call last):
  File "wrong.py", line 3, in <module>
    print u'Álvaro'
UnicodeEncodeError: 'ascii' codec can't encode character u'\xc1' in position 0: ordinal not in range(128)

File right.py:

# coding: utf-8

print u'Álvaro'.encode('utf-8')
# unicode object encoded == `str` in Python 2

Result:

alvaro@ideas:/tmp
$ python right.py 
Álvaro
alvaro@ideas:/tmp
$ python right.py | grep a
Álvaro

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