Rename a file using variables in the program - Python

Question

I want to rename a file called decon.out using two variables in my program. So far I have

gwf = input ("Enter value: ")
myList = os.listdir('.')
    for myFile in myList:
        if re.match("^HHEMQZ", myFile):
            numE = myFile
        elif re.match("^HHNMQZ", myFile):
            numN = myFile
        else: 
            den = myFile
os.rename('decon.out', 'RF'+gwf+''+numE+'')

For example, gwf = 2.5 and numE = HHEMQZ20010101

I would then want decon.out to be renamed as RF2.5HHEMQZ20010101 where RF will always be the same. Currently when I run the script I get an error:

Traceback (most recent call last):
  File "RunDeconv.py", line 77, in <module>
    os.rename('decon.out', 'RF'+gwf+''+numE+'')
TypeError: cannot concatenate 'str' and 'float' objects

Any suggestions?

Are you on Python 2.x?

Sukrit Kalra
– Sukrit Kalra

2013-08-02 11:05:01 +00:00
Commented Aug 2, 2013 at 11:05 — Sukrit Kalra
– Sukrit Kalra, Commented Aug 2, 2013 at 11:05

Martijn Pieters · Accepted Answer · 2013-08-02 11:05:22Z

2

Use raw_input() instead, input() interprets the input values as Python code turning your 2.5 input into a float number.

answered Aug 2, 2013 at 11:05

Martijn Pieters

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Comments

Neaţu Ovidiu Gabriel · Accepted Answer · 2013-08-02 11:29:38Z

0

About the error: in the string concatenation

'RF'+gwf+''+numE+''

all the members must be strings.

You can use

type(gwf)
type(numE)

to check which is a number.

You then just need to

str(gwf)

or

str(numE)

depending on which may be the case. Or probably both gwf and numE need the str() treatment, so your last line of code should look like this:

os.rename('decon.out', 'RF'+str(gwf)+''+str(numE)+'')

edited Aug 2, 2013 at 11:29

answered Aug 2, 2013 at 11:14

Neaţu Ovidiu Gabriel

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