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d�Zd�ZdS(s8General floating point formatting functions.

Functions:
fix(x, digits_behind)
sci(x, digits_behind)

Each takes a number or a string and a number of digits as arguments.

Parameters:
x:             number to be formatted; or a string resembling a number
digits_behind: number of digits behind the decimal point
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rW|SXt|||�\}}t|||�\}}x$|r�|ddkr�|d}q�W|dkr�d}n|dkr�||d|S||SdS(s�Format x as [-]ddd.ddd with 'digs' digits after the point
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