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- List of zeros in python - Stack Overflow
How can I create a list which contains only zeros? I want to be able to create a zeros list for each int in range(10) For example, if the int in the range was 4 I will get: [0,0,0,0] and for 7:
- slice - How slicing in Python works - Stack Overflow
The first way works for a list or a string; the second way only works for a list, because slice assignment isn't allowed for strings Other than that I think the only difference is speed: it looks like it's a little faster the first way Try it yourself with timeit timeit () or preferably timeit repeat ()
- What is the difference between list and list [:] in python?
When reading, list is a reference to the original list, and list[:] shallow-copies the list When assigning, list (re)binds the name and list[:] slice-assigns, replacing what was previously in the list Also, don't use list as a name since it shadows the built-in
- How can I find the index for a given item in a list?
Caveats Linear time-complexity in list length An index call checks every element of the list in order, until it finds a match If the list is long, and if there is no guarantee that the value will be near the beginning, this can slow down the code This problem can only be completely avoided by using a different data structure
- Use a list of values to select rows from a Pandas dataframe
Use a list of values to select rows from a Pandas dataframe Asked 12 years, 11 months ago Modified 4 months ago Viewed 1 8m times
- python - Removing duplicates in lists - Stack Overflow
How can I check if a list has any duplicates and return a new list without duplicates?
- ip - List ALL devices on local network? - Stack Overflow
I want to generate a list of all devices on a local network I have tried the command arp -a and it has listed some devices, but not all of them The ifconfig command shows my IP address and MAC address along with some other useful information, but it doesn't show all of the devices on the local network Is there a command that shows all IP
- TypeError: list indices must be integers or slices, not str
Another common mistake is to initialize a list but try to assign values to it using a key The initialization probably happened dynamically and it's not clear later on that it's in fact a list For example, in the following case, d is initialized as a list but there's an attempt to add a key-value pair to it
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