Eternity of evening sky

2011-03-02

Python, Group a list into chunks in Python - [Python]

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http://webpeipei.blogbus.com/logs/107512519.html

 

将元组中的数据分割为元组

这方法很好用，非常适合目前项目使用，记下来（原文见 Groupe a list into chunks in Python）

def group_iter(iterator, n=2, strict=False):
    accumulator = []
    for item in iterator:
        accumulator.append(item)
        if len(accumulator) == n: # tested as fast as separate counter
            yield tuple(accumulator)
            accumulator = [] # tested faster than accumulator[:] = []
            # and tested as fast as re-using one list object
    if strict and len(accumulator) != 0:
        raise ValueError("Leftover values")

 

lists = ('1','2','c','d','2','3','c','d','3','4','c','d')
gtp =group_iter(lists,4) #conver list to 
log=file('D:\\test.txt','a')
for tp in gtp:
    print '\t'.join(tp)
    log.write('\t'.join(tp))
    log.write('\n')