问题与shebang python - 找不到导入命令

Question

I am tring to run a simple mapper code in python, unix is not recognizing my shebang line, i searched in lot of forums and everywhere it is suggested to add sehbang line and give permission to that file. I did both, but still its not working. It is working only when i add python before the file.

hduser@master:~/code$ ls
mapper.py  reducer.py
hduser@master:~/code$ ls -l
total 8
-rwxrwxr-x 1 hduser hduser 225 Sep 16 07:57 mapper.py
-rw-rw-r-- 1 hduser hduser 663 Sep 16 07:56 reducer.py
hduser@master:~/code$ echo "foo foo quux labs foo bar quux" | python /home/hduser/code/mapper.py
foo     1
foo     1
quux    1
labs    1
foo     1
bar     1
quux    1
hduser@master:~/code$ which python
/usr/bin/python
hduser@master:~/code$ echo "foo foo quux labs foo bar quux" | /home/hduser/code/mapper.py
/home/hduser/code/mapper.py: line 5:
Created on 16/09/2014

@author: jee
: No such file or directory
/home/hduser/code/mapper.py: line 7: $'\r': command not found
/home/hduser/code/mapper.py: line 8: import: command not found
/home/hduser/code/mapper.py: line 9: $'\r': command not found
/home/hduser/code/mapper.py: line 11: syntax error near unexpected token `line'
'home/hduser/code/mapper.py: line 11: `    line = line.strip()
hduser@master:~/code$ vim mapper.py
'''
Created on 16/09/2014

@author: jee
'''
#!/usr/bin/python

import sys

for line in sys.stdin:
    line = line.strip()
    words = line.split()
    for word in words:
        print('%s\t%s' % (word, 1))

Answer 1

The #! has to be on the first line:

#!/usr/bin/python
'''
Created on 16/09/2014

@author: jee
'''

import sys

for line in sys.stdin:
     line = line.strip()
     words = line.split()
     for word in words:
         print('%s\t%s' % (word, 1))

Answer 2

The shebang has to go into the first line of your code.

As it currently stands, you are creating a python statement(the triple quotes), and then importing the shebang.

So, the correct version will be

#!/usr/bin/python
'''
Created on 16/09/2014

@author: jee
'''

import sys

for line in sys.stdin:
    line = line.strip()
    words = line.split()
    for word in words:
        print('%s\t%s' % (word, 1))

Edit

You have a extra character in your shebang line, the windows File ending character. Remove it and you should be good to go. You can check this link to see how to change the encoding in notepadd++.