fd1.seek(0, 2) not locate to the EOF
I am learning 7. Input and Output — Python 3.7.1 documentation
f.seek(offset, from_what).
with such a test, suppose a test with content
In [7]: !cat test
The first line.
I open it in terminal one
In [9]: fd1 = open('test', 'w')
In [10]: fd1.seek(0, 2) #go to the end
Out[10]: 0
Then write into it.
In [18]: fd1.write("This is the second line from terminal 1")
Out[18]: 39
In [19]: fd1.flush()
In [24]: !cat test
This is the second line from terminal 1
The original text are overwritten.
fd1.seek(0, 2) does not work, what' the problem?
python
asked Nov 13 '18 at 2:25
JawSawJawSaw
4,19811634
add a comment |
I am learning 7. Input and Output — Python 3.7.1 documentation
f.seek(offset, from_what).
with such a test, suppose a test with content
In [7]: !cat test
The first line.
I open it in terminal one
In [9]: fd1 = open('test', 'w')
In [10]: fd1.seek(0, 2) #go to the end
Out[10]: 0
Then write into it.
In [18]: fd1.write("This is the second line from terminal 1")
Out[18]: 39
In [19]: fd1.flush()
In [24]: !cat test
This is the second line from terminal 1
The original text are overwritten.
fd1.seek(0, 2) does not work, what' the problem?
python
asked Nov 13 '18 at 2:25
JawSawJawSaw
4,19811634
From the docs about the mode: "'w' open for writing, truncating the file first" (emphasis mine).
– Warren Weckesser
Nov 13 '18 at 2:30
add a comment |
I am learning 7. Input and Output — Python 3.7.1 documentation
f.seek(offset, from_what).
with such a test, suppose a test with content
In [7]: !cat test
The first line.
I open it in terminal one
In [9]: fd1 = open('test', 'w')
In [10]: fd1.seek(0, 2) #go to the end
Out[10]: 0
Then write into it.
In [18]: fd1.write("This is the second line from terminal 1")
Out[18]: 39
In [19]: fd1.flush()
In [24]: !cat test
This is the second line from terminal 1
The original text are overwritten.
fd1.seek(0, 2) does not work, what' the problem?
python
asked Nov 13 '18 at 2:25
JawSawJawSaw
4,19811634
I am learning 7. Input and Output — Python 3.7.1 documentation
f.seek(offset, from_what).
with such a test, suppose a test with content
In [7]: !cat test
The first line.
I open it in terminal one
In [9]: fd1 = open('test', 'w')
In [10]: fd1.seek(0, 2) #go to the end
Out[10]: 0
Then write into it.
In [18]: fd1.write("This is the second line from terminal 1")
Out[18]: 39
In [19]: fd1.flush()
In [24]: !cat test
This is the second line from terminal 1
The original text are overwritten.
fd1.seek(0, 2) does not work, what' the problem?
python
python
asked Nov 13 '18 at 2:25
JawSawJawSaw
4,19811634
asked Nov 13 '18 at 2:25
JawSawJawSaw
4,19811634
asked Nov 13 '18 at 2:25
JawSawJawSaw
4,19811634
asked Nov 13 '18 at 2:25
JawSawJawSaw
4,19811634
asked Nov 13 '18 at 2:25
JawSawJawSaw
4,19811634
4,19811634
From the docs about the mode: "'w' open for writing, truncating the file first" (emphasis mine).
– Warren Weckesser
Nov 13 '18 at 2:30
add a comment |
From the docs about the mode: "'w' open for writing, truncating the file first" (emphasis mine).
– Warren Weckesser
Nov 13 '18 at 2:30
From the docs about the mode: "'w' open for writing, truncating the file first" (emphasis mine).
– Warren Weckesser
Nov 13 '18 at 2:30
From the docs about the mode: "'w' open for writing, truncating the file first" (emphasis mine).
– Warren Weckesser
Nov 13 '18 at 2:30
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53272883%2ffd1-seek0-2-not-locate-to-the-eof%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53272883%2ffd1-seek0-2-not-locate-to-the-eof%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
From the docs about the mode: "'w' open for writing, truncating the file first" (emphasis mine).
– Warren Weckesser
Nov 13 '18 at 2:30