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python Programming Glossary: f.seekGet last n lines of a file with Python, similar to tail http://stackoverflow.com/questions/136168/get-last-n-lines-of-a-file-with-python-similar-to-tail lines. avg_line_length 74 to_read n offset while 1 try f.seek avg_line_length to_read 2 except IOError # woops. apparently.. what we want # to step back go to the beginning instead f.seek 0 pos f.tell lines f.read .splitlines if len lines to_read or.. of ' n' characters. def tail f window 20 BUFSIZ 1024 f.seek 0 2 bytes f.tell size window block 1 data while size 0 and bytes..
Character reading from file in Python http://stackoverflow.com/questions/147741/character-reading-from-file-in-python 'utf 8' mode 'w ' f.write u' u4500 blah blah blah n' f.seek 0 print repr f.readline 1 f.close EDIT I'm assuming that your..
Python file.tell() giving strange numbers? http://stackoverflow.com/questions/15934950/python-file-tell-giving-strange-numbers for the 3rd line Though it looks like an impossible value f.seek 18446744073709551714 is an acceptable value that apparently..
Python: How to read huge text file into memory http://stackoverflow.com/questions/1896674/python-how-to-read-huge-text-file-into-memory m np.zeros linecount dtype 'a' np.uint32 'b' np.uint32 f.seek 0 f csv.reader open 'links.csv' 'rb' for i row in enumerate..
Read and overwrite a file in Python http://stackoverflow.com/questions/2424000/read-and-overwrite-a-file-in-python filename 'r ' text f.read text re.sub 'foobar' 'bar' text f.seek 0 f.write text f.close But the problem is that the old file.. filename 'r ' text f.read text re.sub 'foobar' 'bar' text f.seek 0 f.write text f.truncate f.close share improve this answer..
Most efficient way to search the last x lines of a file in python http://stackoverflow.com/questions/260273/most-efficient-way-to-search-the-last-x-lines-of-a-file-in-python ActiveWin.log_2 # File to check with open fname r as f f.seek 0 2 # Seek @ EOF fsize f.tell # Get Size f.seek max fsize 1024.. r as f f.seek 0 2 # Seek @ EOF fsize f.tell # Get Size f.seek max fsize 1024 0 0 # Set pos @ last n chars lines f.readlines..
Stop reading process output in Python without hang? http://stackoverflow.com/questions/4417962/stop-reading-process-output-in-python-without-hang otherwise the output is garbled # print saved output f.seek 0 # rewind to the beginning of the file print f.read f.close..
how to replace (update) text in a file line by line http://stackoverflow.com/questions/4778697/how-to-replace-update-text-in-a-file-line-by-line the results you'll need to either truncate the file can f.seek 0 then f.truncate or close the original and reopen. Picking.. filename with open fpath 'r ' as f lines f.readlines f.seek 0 f.truncate for line in lines if ' a href ' in line for test..
Python dynamic inheritance: How to choose base class upon instance creation? http://stackoverflow.com/questions/7057019/python-dynamic-inheritance-how-to-choose-base-class-upon-instance-creation Group' @property def data self with self.file_obj as f f.seek 50 return f.read 12 # # class ImagePNG Image '''Fake PNG.. Graphics' @property def data self with self.file_obj as f f.seek 10 return f.read 12 ################################################################################.. Group' @property def data self with self.file_obj as f f.seek 50 return f.read 12 # # class ImagePNG Image '''Fake PNG..
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