col_exists

Synopsis

Determine if a column exists in a crate.

col_exists(crate, name)

Description

• crate - input crate
• name - the column name to check

The col_exists command returns True if the column exists and False if not. The name comparison is case-insensitive.

The get_col_names() routine ("ahelp get_col_names") can be used to find the columns in a Crate.

Example

>>> cr = read_file("evt2.fits")
>>> col_exists(cr, "ENERGY")
True
>>> col_exists(cr, "energy")
True

Note that the check is case-insensitive on the column name.

Changes in CIAO 4.4

The return value is now True or False rather than 1 or 0.

Bugs

See the bug pages on the CIAO website for an up-to-date listing of known bugs.

Refer to the CIAO bug pages for an up-to-date listing of known issues.

See Also

contrib

add_colvals

crates

add_col, copy_colvals, delete_col, get_col, get_col_names, get_colvals, get_number_cols, is_pha, is_rmf, is_virtual, key_exists, set_colvals