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scalar

How to multiply all integers inside list

Try a list comprehension: This goes through l, multiplying each element by two. Of course, there’s more than one way to do it. If you’re into lambda functions and map, you can even do to apply the function lambda x: x * 2 to each element in l. This is equivalent to: Note that map() returns a map object, not a list, so if you … Read more

Categories Python Tags elementwise-operations, list, multiplication, python, scalar

Constructing pandas DataFrame from values in variables gives “ValueError: If using all scalar values, you must pass an index”

The error message says that if you’re passing scalar values, you have to pass an index. So you can either not use scalar values for the columns — e.g. use a list: or use scalar values and pass an index:

Categories Python Tags dataframe, pandas, python, scalar

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