Dec 19, 2008 · For the reverse, see Convert integer to string in Python and Converting a float to a string without rounding it. Please instead use How can I read inputs as numbers? to close duplicate questions where OP received a string from user input and immediately wants to convert it, or was hoping for input (in 3.x) to convert the type automatically.

float(item) do the right thing: it converts its argument to float and and return it, but it doesn't change argument in-place. A simple fix for your code is: new_list = [] for item in list: new_list.append(float(item)) The same code can written shorter using list comprehension: new_list = [float(i) for i in list] To change list in-place:

Aug 29, 2016 · First you seemed to ask "How to convert strings to floats, on csv import", then you morphed it to 'I suppose the overall question is really just "What's the easiest way to read, organize, and synthesize data in .csv or excel format using Python?"' These are seriously different questions (see my answer for real-world examples why), and the answer if you specifically constrain us to using import ...

Apr 1, 2015 · For example: >>> .1 0.10000000000000001 In this case, you're seeing .1 converted to a string using repr: >>> repr(.1) '0.10000000000000001' I believe python chops off the last few digits when you use str () in order to work around this problem, but it's a partial workaround that doesn't substitute for understanding what's going on. >>> str(.1 ...

Jul 9, 2011 · How can I convert a string like 123,456.908 to float 123456.908 in Python? For ints, see How to convert a string to a number if it has commas in it as thousands separators?, although the technique...

May 30, 2017 · How to covert a DataFrame column containing strings and NaN values to floats. And there is another column whose values are strings and floats; how to convert this entire column to floats.

Apr 10, 2009 · If your input is mostly strings that can be converted to floats, the try: except: method is the best native Python method. If your input is mostly strings that cannot be converted to floats, regular expressions or the partition method will be better. If you are 1) unsure of your input or need more speed and 2) don't mind and can install a third-party C-extension, fastnumbers works very well.

The problem is exactly what the Traceback log says: Could not convert string to float If you have a string with only numbers, python's smart enough to do what you're trying and converts the string to a float.

I have a function taking float arguments (generally integers or decimals with one significant digit), and I need to output the values in a string with two decimal places (5 → 5.00, 5.5 → 5.50, etc). How can I do this in Python?

Oct 20, 2009 · How to convert the following hex string to float (single precision 32-bit) in Python? "41973333" -> 1.88999996185302734375E1 "41995C29" -> 1.91700000762939453125E1 "470FC614" -> 3.