python - 一次从特定行和 N 行读取文件

Question

我要从特定行开始读取文件，一次读取 N 行。到目前为止，我一次读了 N 行:

from itertools import islice

n = 10                                                                                    
with open(fname, 'r') as f:                                                               
    while True:                                                                           
        next_n_lines = list(islice(f, n))                                                 
        for line in next_n_lines:                                                         
            print line.rstrip()                                                           
        if not next_n_lines:                                                              
            break

关于从特定行号开始阅读它的任何帮助。

Answer 1

有一个使用 itertools.islice 的简单解决方案:

N = 100  # starting line number
n = 10   # size of a chunk
with open(fname) as f:
    f = islice(f, N, None)  # creates an iterator that starts after N lines
    while True:
        next_n_lines = list(islice(f, n))
        for line in next_n_lines:
            print line.rstrip()
        if not next_n_lines:
            break