No spaces in column headers

[anne17]

CSV exports produced by Sparv should not have spaces in the column headers. (Requested by Markus)

From en e-mail by Faton (KBlabb) on 2022-12-14:

When working with dataframes in Python, R, and Julia, there exist common convenient patterns of indexing and subsetting columns that do not require users to put quotes around the column name. E.g. if there's a column called name in a dataframe df, in Python and Julia, you can retrieve this column by

df.name
and in R:

# Standard base R
df$name

# dplyr in R
df |>
  select(name)

If spaces exist in column names, e.g. if a coulmn is named name 2, then all of the above patterns will produce errors. The users are then limited to a single way of indexing with brackets and quotes around the column name (or renaming the columns). This is the reason why there exists a strong convention in all these languages to not use, and to recommend against using, spaces in column names. Usually underscores _ are used instead.