7、Python 枚举 enumerate
<pre><code>for i,c in enumerate(lista):
print(i,c)</code></pre>
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<pre><code>>>seasons = ['Spring', 'Summer', 'Fall', 'Winter']
>>> list(enumerate(seasons))
[(0, 'Spring'), (1, 'Summer'), (2, 'Fall'), (3, 'Winter')]
>>> list(enumerate(seasons, start=1)) # 下标从 1 开始
[(1, 'Spring'), (2, 'Summer'), (3, 'Fall'), (4, 'Winter')]</code></pre>
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<p>普通的 for 循环</p>
<blockquote>
<blockquote>
<blockquote>
<p>i = 0
seq = ['one', 'two', 'three']
for element in seq:
... print i, seq[i]
... i +=1
...
0 one
1 two
2 three</p>
</blockquote>
</blockquote>
</blockquote>
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<p>for 循环使用 enumerate</p>
<blockquote>
<blockquote>
<blockquote>
<p>seq = ['one', 'two', 'three']
for i, element in enumerate(seq):
... print i, element
...
0 one
1 two
2 three</p>
</blockquote>
</blockquote>
</blockquote>