Python: replace a decimal number in a string -

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i have strings in number of files:

 step.m                                   0.02540:step length

(notice space in first character of string) in of files, there additional spaces between characters:

step . m                                   0.02540 : step length

how can replace decimal number decimal number? i.e. want this:

step.m                                   1.50000:step length

edit add: naturally, decimal number not same in each file.

think mean this,

re.sub(r'\d+\.\d+', '1.50000', s)

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