当文件开始读取时发生的情况太大，无法使用“readlines（）”读取所有行。 [英] what happens when the file begin read is too big for all lines to beread with "readlines()"

问题描述

HI -

很抱歉可能是一个太简单的问题，但我用Google搜索并检查了我的

参考O''Reilly学习Python

书，我没有找到满意的答案。


当我使用readlines时，如果行数很大会怎么样？我有

a非常大的文件（4GB）我想

读入，但我肯定必须对readlines有一些限制我会

想知道python是如何处理的。

我这样使用它：

slines = infile.readlines（）＃读取所有行到一个名为

" slines"


的字符串列表感谢所有知道这个答案的人。

HI -
Sorry for maybe a too simple a question but I googled and also checked my
reference O''Reilly Learning Python
book and I did not find a satisfactory answer.

When I use readlines, what happens if the number of lines is huge? I have
a very big file (4GB) I want to
read in, but I''m sure there must be some limitation to readlines and I''d
like to know how it is handled by python.
I am using it like this:
slines = infile.readlines() # reads all lines into a list of strings called
"slines"

Thanks for anyone who knows the answer to this one.

推荐答案

较新的python应该使用for f in fh：，根据文档：


fh = open（" your文件"）
$ f $ b for x in fh：print x


，一次只读一行。


Ross Reyes写道：

newer python should use "for x in fh:", according to the doc :

fh = open("your file")
for x in fh: print x

which would only read one line at a time.

Ross Reyes wrote:

HI -
抱歉也许是一个太简单的问题，但我用Google搜索并检查了我的
参考O''Reilly学习Python
书和我没有找到一个满意的答案。

当我使用readlines时，如果n线条很大？我有一个非常大的文件（4GB）我想阅读，但我肯定必须对readlines有一些限制，我想知道它是怎么回事由python处理。
我正在使用它：
slines = infile.readlines（）＃将所有行读入一个名为
slines的字符串列表中
<感谢所有知道这个答案的人。

HI -
Sorry for maybe a too simple a question but I googled and also checked my
reference O''Reilly Learning Python
book and I did not find a satisfactory answer.

When I use readlines, what happens if the number of lines is huge? I have
a very big file (4GB) I want to
read in, but I''m sure there must be some limitation to readlines and I''d
like to know how it is handled by python.
I am using it like this:
slines = infile.readlines() # reads all lines into a list of strings called
"slines"

Thanks for anyone who knows the answer to this one.

更新的python应该使用for f in fh： ，根据文件：


fh =打开（你的文件）

for x in fh：print x


，一次只读一行。


Ross Reyes写道：

newer python should use "for x in fh:", according to the doc :

fh = open("your file")
for x in fh: print x

which would only read one line at a time.

Ross Reyes wrote:

HI -
对不起也许也是简单的一个问题，但我谷歌搜索并检查了我的参考O'Reilly学习Python
书，我没有找到一个满意的答案。

当我使用readlines时，会发生什么如果行数很大？我有一个非常大的文件（4GB）我想阅读，但我肯定必须对readlines有一些限制，我想知道它是怎么回事由python处理。
我正在使用它：
slines = infile.readlines（）＃将所有行读入一个名为
slines的字符串列表中
<感谢所有知道这个答案的人。

HI -
Sorry for maybe a too simple a question but I googled and also checked my
reference O''Reilly Learning Python
book and I did not find a satisfactory answer.

When I use readlines, what happens if the number of lines is huge? I have
a very big file (4GB) I want to
read in, but I''m sure there must be some limitation to readlines and I''d
like to know how it is handled by python.
I am using it like this:
slines = infile.readlines() # reads all lines into a list of strings called
"slines"

Thanks for anyone who knows the answer to this one.

Ross Reyes< ro ******* @ rcn.com>写道：

Ross Reyes <ro*******@rcn.com> wrote:

对不起，也许是一个太简单的问题，但我用Google搜索并检查了我的参考O''Reilly学习Python书，我没有找到一个满意的答案。


Python文档在线，熟悉

它很好：


< URL：http：//docs.python.org/>


甚至可以告诉Google只搜索该网站

" site：docs.python.org"作为一个搜索词。

当我使用readlines时，如果行数很大会怎么样？
我有一个非常大的文件（4GB）我想读，但我'我确定
必须对readlines有一些限制，我想知道它是如何由python处理的。

Sorry for maybe a too simple a question but I googled and also
checked my reference O''Reilly Learning Python book and I did not
find a satisfactory answer.
The Python documentation is online, and it''s good to get familiar with
it:

<URL:http://docs.python.org/>

It''s even possible to tell Google to search only that site with
"site:docs.python.org" as a search term.
When I use readlines, what happens if the number of lines is huge?
I have a very big file (4GB) I want to read in, but I''m sure there
must be some limitation to readlines and I''d like to know how it is
handled by python.

关于''文件''类型方法的文档描述了

''readlines''方法，并解决了这个问题。


< URL：http ：//docs.python.org/lib/bltin-file-objects.html#l2h-244>


-

\如果你不是解决方案的一部分，你是|

` \沉淀物的一部分。 - Steven Wright |

_o__）|

Ben Finney

The documentation on methods of the ''file'' type describes the
''readlines'' method, and addresses this concern.

<URL:http://docs.python.org/lib/bltin-file-objects.html#l2h-244>

--
\ "If you''re not part of the solution, you''re part of the |
`\ precipitate." -- Steven Wright |
_o__) |
Ben Finney

这篇关于当文件开始读取时发生的情况太大，无法使用“readlines（）”读取所有行。的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！