Python, print all floats to 2 decimal places in output

Question

I need to output 4 different floats to two decimal places.

This is what I have:

print \'%.2f\' % var1,\'kg =\',\'%.2f\' % var2,\'lb =\',\'%.2f\' % va         


        

Answer 1

If you are looking for readability, I believe that this is that code:

print '%(kg).2f kg = %(lb).2f lb = %(gal).2f gal = %(l).2f l' % {
    'kg': var1,
    'lb': var2,
    'gal': var3,
    'l': var4,
}

Answer 2

I have just discovered the round function - it is in Python 2.7, not sure about 2.6. It takes a float and the number of dps as arguments, so round(22.55555, 2) gives the result 22.56.

Answer 3

Format String Syntax.

https://docs.python.org/3/library/string.html#formatstrings

from math import pi
var1, var2, var3, var4 = pi, pi*2, pi*3, pi*4
'{:0.2f}, kg={:0.2f}, lb={:0.2f}, gal={:0.2f}'.format(var1, var2, var3, var4)

The output would be:

'3.14, kg=6.28, lb=9.42, gal=12.57'

Answer 4

Well I would atleast clean it up as follows:

print "%.2f kg = %.2f lb = %.2f gal = %.2f l" % (var1, var2, var3, var4)

Answer 5

If what you want is to have the print operation automatically change floats to only show 2 decimal places, consider writing a function to replace 'print'. For instance:

def fp(*args):  # fp means 'floating print'
    tmps = []
    for arg in args:
        if type(arg) is float: arg = round(arg, 2)  # transform only floats
        tmps.append(str(arg))
    print(" ".join(tmps)

Use fp() in place of print ...

fp("PI is", 3.14159) ... instead of ... print "PI is", 3.14159

Answer 6

Not directly in the way you want to write that, no. One of the design tenets of Python is "Explicit is better than implicit" (see import this). This means that it's better to describe what you want rather than having the output format depend on some global formatting setting or something. You could of course format your code differently to make it look nicer:

print         '%.2f' % var1, \
      'kg =' ,'%.2f' % var2, \
      'lb =' ,'%.2f' % var3, \
      'gal =','%.2f' % var4, \
      'l'