English 中文(简体)
Why can t I join this tuple in Python?
原标题:
e = ( ham , 5, 1,  bird )
logfile.write( , .join(e))

I have to join it so that I can write it into a text file.

最佳回答

join only takes lists of strings, so convert them first

>>> e = ( ham , 5, 1,  bird )
>>>  , .join(map(str,e))
 ham,5,1,bird 

Or maybe more pythonic

>>>  , .join(str(i) for i in e)
 ham,5,1,bird 
问题回答

join() only works with strings, not with integers. Use , .join(str(i) for i in e).

You might be better off simply converting the tuple to a list first:

e = ( ham , 5, 1, bird ) liste = list(e) , .join(liste)

Use the csv module. It will save a follow-up question about how to handle items containing a comma, followed by another about handling items containing the character that you used to quote/escape the commas.

import csv
e = ( ham , 5, 1,  bird )
with open( out.csv ,  wb ) as f:
    csv.writer(f).writerow(e)

Check it:

print open( out.csv ).read()

Output:

ham,5,1,bird




相关问题
Can Django models use MySQL functions?

Is there a way to force Django models to pass a field to a MySQL function every time the model data is read or loaded? To clarify what I mean in SQL, I want the Django model to produce something like ...

An enterprise scheduler for python (like quartz)

I am looking for an enterprise tasks scheduler for python, like quartz is for Java. Requirements: Persistent: if the process restarts or the machine restarts, then all the jobs must stay there and ...

How to remove unique, then duplicate dictionaries in a list?

Given the following list that contains some duplicate and some unique dictionaries, what is the best method to remove unique dictionaries first, then reduce the duplicate dictionaries to single ...

What is suggested seed value to use with random.seed()?

Simple enough question: I m using python random module to generate random integers. I want to know what is the suggested value to use with the random.seed() function? Currently I am letting this ...

How can I make the PyDev editor selectively ignore errors?

I m using PyDev under Eclipse to write some Jython code. I ve got numerous instances where I need to do something like this: import com.work.project.component.client.Interface.ISubInterface as ...

How do I profile `paster serve` s startup time?

Python s paster serve app.ini is taking longer than I would like to be ready for the first request. I know how to profile requests with middleware, but how do I profile the initialization time? I ...

Pragmatically adding give-aways/freebies to an online store

Our business currently has an online store and recently we ve been offering free specials to our customers. Right now, we simply display the special and give the buyer a notice stating we will add the ...

Converting Dictionary to List? [duplicate]

I m trying to convert a Python dictionary into a Python list, in order to perform some calculations. #My dictionary dict = {} dict[ Capital ]="London" dict[ Food ]="Fish&Chips" dict[ 2012 ]="...

热门标签