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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 ()
- python - if else in a list comprehension - Stack Overflow
Since a list comprehension creates a list, it shouldn't be used if creating a list is not the goal; it shouldn't be used simply to write a one-line for-loop; so refrain from writing [print(x) for x in range(5)] for example
- 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
- List unique values in a Pandas dataframe - Stack Overflow
You can get the unique values in the whole df with this one-liner: pd Series(df values flatten()) unique() You basically transform your df to a numpy array, flatten and come back to a pandas Series, so you can use unique() However, types might be transformed along the way if you have multiple types in your original df, so be careful
- How to cast List lt;Object gt; to List lt;MyClass gt; - Stack Overflow
You can't directly cast List to List because Java generics are invariant This means that List is not the same as List, even though Customer is a subtype of Object
- How can I pass a list as a command-line argument with argparse?
Don't use quotes on the command line 1 Don't use type=list, as it will return a list of lists This happens because under the hood argparse uses the value of type to coerce each individual given argument you your chosen type, not the aggregate of all arguments You can use type=int (or whatever) to get a list of ints (or whatever)
- What is the syntax to insert one list into another list in python?
What is the syntax to insert one list into another list in python? [duplicate] Asked 14 years, 10 months ago Modified 6 years, 1 month ago Viewed 349k times
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