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| 小白求助，在看《python3-cookbook》遇到的问题 Python • scp404 • Aug 8, 2019 • Lastly replied by scp404 | 3 |
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Aug 8, 2019 Replied to a topic by scp404 › Python › 小白求助，在看《python3-cookbook》遇到的问题 |
@chenstack 我的错...代码贴错了，之前运行的时候变量名是对的。不过我把 txt 的内容换成老哥你的，能出结果。谢谢老哥了。
Aug 8, 2019 Replied to a topic by scp404 › Python › 小白求助，在看《python3-cookbook》遇到的问题 |
我的错...代码贴错了
直接 copy 书里的源码是这样的
```
from collections import deque
def search(lines, pattern, history=5):
previous_lines = deque(maxlen=history)
for line in lines:
if pattern in line:
yield line, previous_lines
previous_lines.append(line)
# Example use on a file
if __name__ == '__main__':
with open(r'../../cookbook/somefile.txt') as f:
for line, prevlines in search(f, 'python', 5):
for pline in prevlines:
print(pline, end='')
print(line, end='')
print('-' * 20)
```
没打印出东西
我是不是回复不了图片。。。
直接 copy 书里的源码是这样的
```
from collections import deque
def search(lines, pattern, history=5):
previous_lines = deque(maxlen=history)
for line in lines:
if pattern in line:
yield line, previous_lines
previous_lines.append(line)
# Example use on a file
if __name__ == '__main__':
with open(r'../../cookbook/somefile.txt') as f:
for line, prevlines in search(f, 'python', 5):
for pline in prevlines:
print(pline, end='')
print(line, end='')
print('-' * 20)
```
没打印出东西
我是不是回复不了图片。。。
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