41 lines
1.2 KiB
Python
41 lines
1.2 KiB
Python
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#!/usr/bin/env python
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#
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# Copyright (C) 2018 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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Merge mutliple CSV files, possibly with different columns, writing to stdout.
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"""
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import csv
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import sys
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csv_readers = [
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csv.DictReader(open(csv_file, 'rb'), delimiter=',', quotechar='|')
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for csv_file in sys.argv[1:]
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]
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# Build union of all columns from source files:
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headers = set()
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for reader in csv_readers:
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headers = headers.union(reader.fieldnames)
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# Concatenate all files to output:
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out = csv.DictWriter(sys.stdout, delimiter=',', quotechar='|', fieldnames = sorted(headers))
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out.writeheader()
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for reader in csv_readers:
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for row in reader:
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out.writerow(row)
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