Displaying 6.5235375356299998e-07 without exponential notation

python floating-point exponential
StefanS picture StefanS · Feb 8, 2012 · Viewed 8.7k times · Source

I have to convert exponential strings, like 6.5235375356299998e-07, to a float value, and display the result of my computation like 0.00000065235... How can I do this in a Python program?

Answer

eumiro picture eumiro · Feb 8, 2012

6.5235375356299998e-07 is a perfectly legal float even if there is an e in it. You can do the whole calculation with it:

>>> 6.5235375356299998e-07 * 10000000
6.5235375356300001

>>> 6.5235375356299998e-07 + 10000000
10000000.000000652

In the second case, many digits will disappear because of the precision of a python's float.

If you need the string representation without e, try this:

>>> '{0:.20f}'.format(6.5235375356299998e-07)
'0.00000065235375356300'

but it will become a string and you won't be able to do any calculus with it any more.

Related questions

How do I parse a string to a float or int?

In Python, how can I parse a numeric string like "545.2222" to its corresponding float value, 545.2222? Or parse the string "31" to an integer, 31? I just want to know how to parse a float str to a float, and (separately) an int …

Read More
Limiting floats to two decimal points

I want a to be rounded to 13.95. >>> a 13.949999999999999 >>> round(a, 2) 13.949999999999999 The round function does not work the way I expected.

Read More
How do I check if a string is a number (float)?

What is the best possible way to check if a string can be represented as a number in Python? The function I currently have right now is: def is_number(s): try: float(s) return True except ValueError: return False …

Read More