例9.5 使用序列

code/seq.py）#!/usr/bin/python# Filename: seq.pyshoplist = ['apple', 'mango', 'carrot', 'banana']# Indexing or 'Subscription' operationprint 'Item 0 is', shoplist[0]print 'Item 1 is', shop

小尼人00

537人浏览 · 2014-08-11 17:18:00

小尼人00 · 2014-08-11 17:18:00 发布

源文件：code/reference.py

#!/usr/bin/python
# Filename: reference.py

print 'Simple Assignment'
shoplist = ['apple', 'mango', 'carrot', 'banana']
mylist = shoplist # mylist is just another name pointing to the same object!

del shoplist[0]

print 'shoplist is', shoplist
print 'mylist is', mylist
# notice that both shoplist and mylist both print the same list without
# the 'apple' confirming that they point to the same object

print 'Copy by making a full slice'
mylist = shoplist[:] # make a copy by doing a full slice
del mylist[0] # remove first item

print 'shoplist is', shoplist
print 'mylist is', mylist
# notice that now the two lists are different

输出

$ python reference.py
Simple Assignment
shoplist is ['mango', 'carrot', 'banana']
mylist is ['mango', 'carrot', 'banana']
Copy by making a full slice
shoplist is ['mango', 'carrot', 'banana']
mylist is ['carrot', 'banana']

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