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                <textarea name="file_content" style="width:100%; height:400px; font-family:monospace;">&quot;&quot;&quot;General 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
&quot;&quot;&quot;
from warnings import warnpy3k
warnpy3k(&quot;the fpformat module has been removed in Python 3.0&quot;, stacklevel=2)
del warnpy3k

import re

__all__ = [&quot;fix&quot;,&quot;sci&quot;,&quot;NotANumber&quot;]

# Compiled regular expression to &quot;decode&quot; a number
decoder = re.compile(r&#039;^([-+]?)(\d*)((?:\.\d*)?)(([eE][-+]?\d+)?)$&#039;)
# \0 the whole thing
# \1 leading sign or empty
# \2 digits left of decimal point
# \3 fraction (empty or begins with point)
# \4 exponent part (empty or begins with &#039;e&#039; or &#039;E&#039;)

try:
    class NotANumber(ValueError):
        pass
except TypeError:
    NotANumber = &#039;fpformat.NotANumber&#039;

def extract(s):
    &quot;&quot;&quot;Return (sign, intpart, fraction, expo) or raise an exception:
    sign is &#039;+&#039; or &#039;-&#039;
    intpart is 0 or more digits beginning with a nonzero
    fraction is 0 or more digits
    expo is an integer&quot;&quot;&quot;
    res = decoder.match(s)
    if res is None: raise NotANumber, s
    sign, intpart, fraction, exppart = res.group(1,2,3,4)
    intpart = intpart.lstrip(&#039;0&#039;);
    if sign == &#039;+&#039;: sign = &#039;&#039;
    if fraction: fraction = fraction[1:]
    if exppart: expo = int(exppart[1:])
    else: expo = 0
    return sign, intpart, fraction, expo

def unexpo(intpart, fraction, expo):
    &quot;&quot;&quot;Remove the exponent by changing intpart and fraction.&quot;&quot;&quot;
    if expo &gt; 0: # Move the point left
        f = len(fraction)
        intpart, fraction = intpart + fraction[:expo], fraction[expo:]
        if expo &gt; f:
            intpart = intpart + &#039;0&#039;*(expo-f)
    elif expo &lt; 0: # Move the point right
        i = len(intpart)
        intpart, fraction = intpart[:expo], intpart[expo:] + fraction
        if expo &lt; -i:
            fraction = &#039;0&#039;*(-expo-i) + fraction
    return intpart, fraction

def roundfrac(intpart, fraction, digs):
    &quot;&quot;&quot;Round or extend the fraction to size digs.&quot;&quot;&quot;
    f = len(fraction)
    if f &lt;= digs:
        return intpart, fraction + &#039;0&#039;*(digs-f)
    i = len(intpart)
    if i+digs &lt; 0:
        return &#039;0&#039;*-digs, &#039;&#039;
    total = intpart + fraction
    nextdigit = total[i+digs]
    if nextdigit &gt;= &#039;5&#039;: # Hard case: increment last digit, may have carry!
        n = i + digs - 1
        while n &gt;= 0:
            if total[n] != &#039;9&#039;: break
            n = n-1
        else:
            total = &#039;0&#039; + total
            i = i+1
            n = 0
        total = total[:n] + chr(ord(total[n]) + 1) + &#039;0&#039;*(len(total)-n-1)
        intpart, fraction = total[:i], total[i:]
    if digs &gt;= 0:
        return intpart, fraction[:digs]
    else:
        return intpart[:digs] + &#039;0&#039;*-digs, &#039;&#039;

def fix(x, digs):
    &quot;&quot;&quot;Format x as [-]ddd.ddd with &#039;digs&#039; digits after the point
    and at least one digit before.
    If digs &lt;= 0, the point is suppressed.&quot;&quot;&quot;
    if type(x) != type(&#039;&#039;): x = repr(x)
    try:
        sign, intpart, fraction, expo = extract(x)
    except NotANumber:
        return x
    intpart, fraction = unexpo(intpart, fraction, expo)
    intpart, fraction = roundfrac(intpart, fraction, digs)
    while intpart and intpart[0] == &#039;0&#039;: intpart = intpart[1:]
    if intpart == &#039;&#039;: intpart = &#039;0&#039;
    if digs &gt; 0: return sign + intpart + &#039;.&#039; + fraction
    else: return sign + intpart

def sci(x, digs):
    &quot;&quot;&quot;Format x as [-]d.dddE[+-]ddd with &#039;digs&#039; digits after the point
    and exactly one digit before.
    If digs is &lt;= 0, one digit is kept and the point is suppressed.&quot;&quot;&quot;
    if type(x) != type(&#039;&#039;): x = repr(x)
    sign, intpart, fraction, expo = extract(x)
    if not intpart:
        while fraction and fraction[0] == &#039;0&#039;:
            fraction = fraction[1:]
            expo = expo - 1
        if fraction:
            intpart, fraction = fraction[0], fraction[1:]
            expo = expo - 1
        else:
            intpart = &#039;0&#039;
    else:
        expo = expo + len(intpart) - 1
        intpart, fraction = intpart[0], intpart[1:] + fraction
    digs = max(0, digs)
    intpart, fraction = roundfrac(intpart, fraction, digs)
    if len(intpart) &gt; 1:
        intpart, fraction, expo = \
            intpart[0], intpart[1:] + fraction[:-1], \
            expo + len(intpart) - 1
    s = sign + intpart
    if digs &gt; 0: s = s + &#039;.&#039; + fraction
    e = repr(abs(expo))
    e = &#039;0&#039;*(3-len(e)) + e
    if expo &lt; 0: e = &#039;-&#039; + e
    else: e = &#039;+&#039; + e
    return s + &#039;e&#039; + e

def test():
    &quot;&quot;&quot;Interactive test run.&quot;&quot;&quot;
    try:
        while 1:
            x, digs = input(&#039;Enter (x, digs): &#039;)
            print x, fix(x, digs), sci(x, digs)
    except (EOFError, KeyboardInterrupt):
        pass
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