49 lines
1.2 KiB
Python
49 lines
1.2 KiB
Python
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#!/usr/bin/env python
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# -*- encoding: utf-8 -*-
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"""
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Topic: 迭代并跟踪索引
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Desc :
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"""
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from collections import defaultdict
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def iterate_index():
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my_list = ['a', 'b', 'c']
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for idx, val in enumerate(my_list):
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print(idx, val)
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# 索引从1开始
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for idx, val in enumerate(my_list, 1):
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print(idx, val)
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# 序列中含有元组的解压
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data = [ (1, 2), (3, 4), (5, 6), (7, 8) ]
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for n, (x, y) in enumerate(data):
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print(n)
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print(x, y)
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def parse_data(filename):
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with open(filename, 'rt') as f:
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for lineno, line in enumerate(f, 1):
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fields = line.split()
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try:
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count = int(fields[1])
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# ...
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except ValueError as e:
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print('Line {}: Parse error: {}'.format(lineno, e))
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def word_lines():
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word_summary = defaultdict(list)
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with open('myfile.txt', 'r') as f:
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lines = f.readlines()
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for idx, line in enumerate(lines):
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# Create a list of words in current line
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words = [w.strip().lower() for w in line.split()]
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for word in words:
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word_summary[word].append(idx)
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if __name__ == '__main__':
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iterate_index()
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