python - Variable decimal place limit in function set by user? -


i started learning python , writing script converts celsius fahrenheit , vise versa. have main part done want able let user set number of decimals displayed in output... first function contains failed attempt , second set @ 2 decimal places.

def convert_f_to_c(t,xx): c = (t - 32) * (5.0 / 9) print "%.%f" % (c, xx)  def convert_c_to_f(t):     f = 1.8 * t + 32     print "%.2f" % f       print "number of decimal places?" dec = raw_input(">")  print "(c) celsius >>> ferenheit\n(f) ferenheit >>> celcius" option = raw_input(">")  if option == 'c':     cel = int(raw_input("temperature in celcius?"))     convert_c_to_f(cel)  else:      fer = int(raw_input("temperature in ferenheit?"))     convert_f_to_c(fer,dec) 

num_dec = int(raw_input("num decimal places?") print "%0.*f"%(num_dec,3.145678923678)

in % format strings can use * feature

afaik there no equivelent method in '{}'.formatmethod

>>> import math >>> print "%0.*f"%(3,math.pi) 3.142 >>> print "%0.*f"%(13,math.pi) 3.1415926535898 >>>

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