CODEWITHSUNDEEP
pythondecimalrounding
Benjamin Cox
Benjamin Cox

Reputation: 17

How can limit a certain number of decimal places being shown without rounding?

I would like to be able to limit the amount of decimal places that are shown from a print function without any sort of rounding system

v = 8.836333333333339

print ('%.2f' % v)

This code will print the value of v to two decimal places but also rounds it up or down, how could I make it stop this rounding please?

Upvotes: 0

Views: 232

Answers (5)

kashif iqbal
kashif iqbal

Reputation: 11

<?php
$value_exp = explode(".", 245.788968);
$value_new = floatval($value_exp[0].'.'.substr($value_exp[1],0,4));
echo $value_new; //output will 245.7889
?>

Upvotes: -1

beroe
beroe

Reputation: 12316

A bit specific to your case, but you could also use int to truncate:

 >>> print(int(v*100)/100.0)
 8.83

It times at about 3x faster (310 ns vs 925 ns) than the string find-based approach.

Upvotes: 0

Lily Mara
Lily Mara

Reputation: 4128

If you know how long the number will be, you can easily accomplish this with string slicing.

>>> v = 8.836333333333339
>>> x = str(v) # get string representation of 'v'
>>> x
'8.836333333333339'

>>> y = x[0:4] # every character in 'x' between 0 and 4 but not including 4
>>> y
'8.83'

>>> v = float(y) # you can even convert it back to a number if you want
>>> v
8.83

Upvotes: 1

ooga
ooga

Reputation: 15501

You could process it as a string:

v = 8.836333333333339
s = str(v)
print s[:s.find('.')+3]

# prints 8.83

Upvotes: 1

James Sapam
James Sapam

Reputation: 16940

How about using decimal module :

>>> help(Decimal.quantize)
Help on method quantize in module decimal:

quantize(self, exp, rounding=None, context=None, watchexp=True) unbound decimal.Decimal    
method
    Quantize self so its exponent is the same as that of exp.

Similar to self._rescale(exp._exp) but with error checking.


>>> from decimal import *
>>> v = 8.834333333333339
>>> print Decimal(v).quantize(Decimal('0.01'))
8.83
>>> print Decimal('8.8663').quantize(Decimal('0.01'))
8.87 
>>> print Decimal('8.863').quantize(Decimal('0.01'))
8.86
>>>

Upvotes: 0

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