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Fix headers for list of dicts #247

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@jhadida jhadida commented Feb 4, 2023

This contribution corrects the behavior of the headers option when the input data is a list of dict.

  1. Fix the behavior of headers="firstrow". The example below illustrates the current behavior, which is incorrect:
x = [ {'b': 'B', 'a': 'A'}, 
      {'a': 1, 'b': 2}, 
      {'a': 3, 'b': 4, 'c': 5} ]

print(tabulate( x, headers='firstrow' ))

# Current output:
#
#   B    A    c
# ---  ---  ---
#   2    1
#   4    3    5

# Proposed output:
#
#   B    A
# ---  ---
#   2    1
#   4    3
  1. Fix the current behavior when headers is specified as a list of keys:
x = [ {'a': 1, 'b': 2}, 
      {'a': 3, 'b': 4, 'c': 5} ]

print(tabulate( x, headers=['b','a'] ))

# Current output:
#
#       b    a
# --  ---  ---
#  1    2
#  3    4    5

# Proposed output:
#
#   b    a
# ---  ---
#   2    1
#   4    3

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