Python - 指数中的位数 [英] Python - number of digits in exponent

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问题描述

是否可以设置用于打印浮点数的指数的位数?我想将它设置为3.



目前,

  f = 0.0000870927939438012 
>>> %.14e%f
'8.70927939438012e-05'
>>> %0.14e%f
'8.709279e-005'

我想要print是:
'8.70927939438012e-005'

解决方案

有没有办法控制,最好的办法是为此编写一个函数

  def eformat(f,prec ,exp_digits):
s =%。* e%(prec,f)
尾数,exp = s.split('e')
# ($,$,$,$,$,$,$,$,$,$)
print eformat(1.0000870927939438012e5,14,3)
print eformat(1.1e123,4,4)
print eformat(1.1e-123,4,4)

$ b $输出:

  8.70927939438012e -005 
1.00008709279394e + 005
1.1000e + 0123
1.1000e-0123


Is it possible to set the number of digits to be used for printing the exponent of a floating-point number? I want to set it to 3.

Currently,

f = 0.0000870927939438012
>>> "%.14e"%f
'8.70927939438012e-05'
>>> "%0.14e"%f
'8.709279e-005'

What I want to print is: '8.70927939438012e-005'

解决方案

There is a no way to control that, best way is to write a function for this e.g.

def eformat(f, prec, exp_digits):
    s = "%.*e"%(prec, f)
    mantissa, exp = s.split('e')
    # add 1 to digits as 1 is taken by sign +/-
    return "%se%+0*d"%(mantissa, exp_digits+1, int(exp))

print eformat(0.0000870927939438012, 14, 3)
print eformat(1.0000870927939438012e5, 14, 3)
print eformat(1.1e123, 4, 4)
print eformat(1.1e-123, 4, 4)

Output:

8.70927939438012e-005
1.00008709279394e+005
1.1000e+0123
1.1000e-0123

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