__init__(self, a, b, ignore_keywords=[], ignore_comments=[], rtol=0.0, atol=0.0, ignore_blanks=True, ignore_blank_cards=True)
A header.
A header to compare to the first header.
Header keywords to ignore when comparing two headers; the presence of these keywords and their values are ignored. Wildcard strings may also be included in the list.
A list of header keywords whose comments should be ignored in the comparison. May contain wildcard strings as with ignore_keywords.
The number of pixel/table values to output when reporting HDU data differences. Though the count of differences is the same either way, this allows controlling the number of different values that are kept in memory or output. If a negative value is given, then numdiffs is treated as unlimited (default: 10).
The relative difference to allow when comparing two float values either in header values, image arrays, or table columns (default: 0.0). Values which satisfy the expression
$$\left| a - b \right| > \text{atol} + \text{rtol} \cdot \left| b \right|$$are considered to be different. The underlying function used for comparison is numpy.allclose
.
The allowed absolute difference. See also rtol
parameter.
Ignore extra whitespace at the end of string values either in headers or data. Extra leading whitespace is not ignored (default: True).
Ignore all cards that are blank, i.e. they only contain whitespace (default: True).
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