# How to round to 2 decimals with Python?

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I am getting a lot of decimals in the output of this code (Fahrenheit to Celsius converter).

My code currently looks like this:

``````def main():
printC(formeln(typeHere()))

def typeHere():
global Fahrenheit
try:
Fahrenheit = int(raw_input("Hi! Enter Fahrenheit value, and get it in Celsius!
"))
except ValueError:
print "
Your insertion was not a digit!"
print "We"ve put your Fahrenheit value to 50!"
Fahrenheit = 50
return Fahrenheit

def formeln(c):
Celsius = (Fahrenheit - 32.00) * 5.00/9.00
return Celsius

print "
Your Celsius value is " + answer + " C.
"

main()
``````

So my question is, how do I make the program round every answer to the 2nd decimal place?

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## How to round to 2 decimals with Python? insert: Questions

How to insert newlines on argparse help text?

I"m using `argparse` in Python 2.7 for parsing input options. One of my options is a multiple choice. I want to make a list in its help text, e.g.

``````from argparse import ArgumentParser

parser = ArgumentParser(description="test")

parser.add_argument("-g", choices=["a", "b", "g", "d", "e"], default="a",
help="Some option, where
"
" a = alpha
"
" b = beta
"
" g = gamma
"
" d = delta
"
" e = epsilon")

parser.parse_args()
``````

However, `argparse` strips all newlines and consecutive spaces. The result looks like

```~/Downloads:52\$ python2.7 x.py -h
usage: x.py [-h] [-g {a,b,g,d,e}]

test

optional arguments:
-h, --help      show this help message and exit
-g {a,b,g,d,e}  Some option, where a = alpha b = beta g = gamma d = delta e
= epsilon
```

How to insert newlines in the help text?

406

Try using `RawTextHelpFormatter`:

``````from argparse import RawTextHelpFormatter
parser = ArgumentParser(description="test", formatter_class=RawTextHelpFormatter)
``````

## How to round to 2 decimals with Python? insert: Questions

Is a Python list guaranteed to have its elements stay in the order they are inserted in?

If I have the following Python code

``````>>> x = []
>>> x = x + 
>>> x = x + 
>>> x = x + 
>>> x
[1, 2, 3]
``````

Will `x` be guaranteed to always be `[1,2,3]`, or are other orderings of the interim elements possible?

366

Yes, the order of elements in a python list is persistent.

## How to round to 2 decimals with Python? insert: Questions

Inserting image into IPython notebook markdown

I am starting to depend heavily on the IPython notebook app to develop and document algorithms. It is awesome; but there is something that seems like it should be possible, but I can"t figure out how to do it:

I would like to insert a local image into my (local) IPython notebook markdown to aid in documenting an algorithm. I know enough to add something like `<img src="image.png">` to the markdown, but that is about as far as my knowledge goes. I assume I could put the image in the directory represented by 127.0.0.1:8888 (or some subdirectory) to be able to access it, but I can"t figure out where that directory is. (I"m working on a mac.) So, is it possible to do what I"m trying to do without too much trouble?

277

Most of the answers given so far go in the wrong direction, suggesting to load additional libraries and use the code instead of markup. In Ipython/Jupyter Notebooks it is very simple. Make sure the cell is indeed in markup and to display a image use:

``````![alt text](imagename.png "Title")
``````

Further advantage compared to the other methods proposed is that you can display all common file formats including jpg, png, and gif (animations).

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