Newest Python Questions | Wyzant Ask An Expert

06/15/19

Exact change in Python

Write a program with total change amount as an integer input, and output the change using the fewest coins, one coin type per line. The coin types are dollars, quarters, dimes, nickels, and... more

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Python List Slice

06/14/19

Understanding slice notation?

I need a good explanation (references are a plus) on Python's slice notation. To me, this notation needs a bit of picking up. It looks extremely powerful, but I haven't quite got my head around it.

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Python List Concatenation

06/14/19

How to concatenate two lists in Python?

How do I concatenate two lists in Python?Example: listone = [1, 2, 3] listtwo = [4, 5, 6] Expected outcome: >>> joinedlist [1, 2, 3, 4, 5, 6]

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Python Termination

06/14/19

Terminating a Python script?

I am aware of the `die()` command in PHP which stops a script early.How can I do this in Python?

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Python Dictionary Merge

06/14/19

How to merge two dictionaries in a single expression?

I have two Python dictionaries, and I want to write a single expression that returns these two dictionaries, merged. The `update()` method would be what I need, if it returned its result instead... more

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Python Syntax Line Breaks Long Lines

06/14/19

How can I do a line break (line continuation) in Python?

I have a long line of code that I want to break up among multiple lines. What do I use and what is the syntax?For example, adding a bunch of strings, e = 'a' + 'b' + 'c' + 'd'and have it in two... more

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Python Virtualenv Virtualenvwrapper

06/14/19

Use different Python version with virtualenv?

I have a Debian system currently running with python 2.5.4. I got virtualenv properly installed, everything is working fine. Is there a possibility that I can use a virtualenv with a different... more

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Python Graph Plot Visualization

06/14/19

How do you change the size of figures drawn with matplotlib?

How do you change the size of figure drawn with matplotlib?

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Answers •1

Python Performance Profiling Benchmarking

06/14/19

Why does Python code run faster in a function?

def main(): for i in xrange(10**8): pass main()This piece of code in Python runs in (Note: The timing is done with the time function in BASH in Linux.) real 0m1.841s ... more

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Python String List Join

06/14/19

Python join: why is it string.join(list) instead of list.join(string)?

This has always confused me. It seems like this would be nicer: my_list = ["Hello", "world"] print my_list.join("-") # Produce: "Hello-world"Than this: my_list = ["Hello", "world"] ... more

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Python Intersection Algorithm List

06/14/19

Removing duplicates in lists?

Pretty much I need to write a program to check if a list has any duplicates and if it does it removes them and returns a new list with the items that werent duplicated/removed. This is what I have... more

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Python Setup.py Pypi

06/14/19

python setup.py uninstall?

I have installed a python package with `python setup.py install`.How do I uninstall it?

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Answers •1

Python Constants

06/13/19

How do I create a constant in Python?

Is there a way to declare a constant in Python? In Java we can create constant values in this manner: public static final String CONST_NAME = "Name";What is the... more

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Python Ide Editor

06/13/19

What IDE to use for Python?

What IDEs ("GUIs/editors") do others use for Python coding?

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Answers •1

Python Pandas Dataframe

06/13/19

Get list from pandas DataFrame column headers?

I want to get a list of the column headers from a pandas DataFrame. The DataFrame will come from user input so I won't know how many columns there will be or what they will be called.For example,... more

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Python Dictionary

06/12/19

Check if a given key already exists in a dictionary?

I wanted to test if a key exists in a dictionary before updating the value for the key.I wrote the following code: if 'key1' in dict.keys(): print "blah" else: print "boo"I think... more

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Python Inheritance Types Oop

06/11/19

What are the differences between type() and isinstance()?

What are the differences between these two code fragments?Using `type()`: import types if type(a) is types.DictType: do_something() if type(b) in types.StringTypes: ... more

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Python Casting Type Conversion Floating Point

06/11/19

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) ... more

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Python Computer Programming

06/10/19

What is Tensorflow Python?

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Python Class Static Class Variables

06/10/19

Are static class variables possible?

Is it possible to have static class variables or methods in python? What syntax is required to do this?

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Answers •2

Python Coding Style

06/08/19

Single quotes vs. double quotes in Python?

According to the documentation, they're pretty much interchangeable. Is there a stylistic reason to use one over the other?

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Answers •1

Python Windows Pip Setup.py

06/08/19

error: Unable to find vcvarsall.bat?

I tried to install the Python package [dulwich](https://pypi.python.org/pypi/dulwich): pip install dulwichBut I get a cryptic error message: error:... more

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Answers •1

Python Json

06/08/19

How do I write JSON data to a file?

I have JSON data stored in the variable `data`.I want to write this to a text file for testing so I don't have to grab the data from the server each time.Currently, I am trying this: obj =... more

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Python String Comparison Equality

06/08/19

Why does comparing strings using either '==' or 'is' sometimes produce a different result?

I've got a Python program where two variables are set to the value `'public'`. In a conditional expression I have the comparison `var1 is var2` which fails, but if I change it to `var1 == var2` it... more

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Python Shell Command Subprocess

06/08/19

Calling an external command in Python?

How can I call an external command (as if I'd typed it at the Unix shell or Windows command prompt) from within a Python script?

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Answers •1

Exact change in Python

Understanding slice notation?

How to concatenate two lists in Python?

Terminating a Python script?

How to merge two dictionaries in a single expression?

How can I do a line break (line continuation) in Python?

Use different Python version with virtualenv?

How do you change the size of figures drawn with matplotlib?

Why does Python code run faster in a function?

Python join: why is it string.join(list) instead of list.join(string)?

Removing duplicates in lists?

python setup.py uninstall?

How do I create a constant in Python?

What IDE to use for Python?

Get list from pandas DataFrame column headers?

Check if a given key already exists in a dictionary?

What are the differences between type() and isinstance()?

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

What is Tensorflow Python?

Are static class variables possible?

Single quotes vs. double quotes in Python?

error: Unable to find vcvarsall.bat?

How do I write JSON data to a file?

Why does comparing strings using either '==' or 'is' sometimes produce a different result?

Calling an external command in Python?

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