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I'm a beginner in python and easily get stucked and confused...

When I read a file which contains a table with numbers with digits, it reads it as an numpy.ndarray

Python is changing the display of the numbers. For example: In the input file i have this number: 56143.0254154 and in the output file the number is written as: 5.61430254e+04

but i want to keep the first format in the output file. i tried to use the string.format or locale.format functions but it doesn't work

Can anybody help me to do this?

Thanks! Ruxy

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    Could you give more context? How are you writing to the file for instance? Commented Feb 6, 2013 at 16:10

3 Answers 3

Reset to default
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Try numpy.set_printoptions() -- there you can e.g. specify the number of digits that are printed and suppress the scientific notation. For example, numpy.set_printoptions(precision=8,suppress=True) will print 8 digits and no "...e+xx".

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does this work when saving the array via np.savetxt(). thanks!
After testing, it looks like it doesn't. It is still necessary to set the format via np.savetxt(... ,fmt='%f') etc. Info on formatting can be found here.
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If you are printing a numpy array, you can control the format of the different data types by using the set_printoptions function. For example:

In [39]: a = array([56143.0254154, 1.234, 0.012345])

In [40]: print(a)
[  5.61430254e+04   1.23400000e+00   1.23450000e-02]

In [41]: set_printoptions(formatter=dict(float=lambda t: "%14.7f" % t))

In [42]: print(a)
[ 56143.0254154      1.2340000      0.0123450]
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You must create a formatted string. Assuming variable number contains the number you want to print, in Python 2.7 or 3, you could use

print("{:20.7f}".format(number))

whereas in Python 2:

print "%20.7f" % number

Alternatively, if you use Numpy routines to write out the array, use the method suggested by Warren.

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