File open binary mode

The file is created if it does not exist, otherwise it is truncated. The stream is positioned at the beginning of the file. For the Python csv module in particular, the answer is simple: it's required by the documentation. How are we doing? Please help us improve Stack Overflow.

Take our short survey. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. When to open file in binary mode b? Ask Question. Asked 6 years, 6 months ago. Active 6 years, 6 months ago. Viewed 27k times.

Community Bot 1 1 1 silver badge. Celeritas Celeritas JoranBeasley: there is not such thing as "ascii mode". Use the term "text mode" instead the character encoding of a text file can be anything.

Add a comment. Active Oldest Votes. From the docs : "If it is '', universal newlines mode is enabled, but line endings are returned to the caller untranslated. Quiz-summary 0 of 10 questions completed Questions: 1 2 3 4 5 6 7 8 9 You have already completed the quiz before. Hence you can not start it again.

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Your result has been entered into leaderboard Loading. Answered Review. Question 1 of Which functions use to check if a file exists? How do you insert something on a new line in a file?

If your filename has spaces in it, put quotation marks around it, like this:. The " " character, called a "pipe" in this context, sends the output of format-hex as though through a pipe hence the name to another program called "more". The latter lets you page forward through the file, one screenful or one line at a time. To see the next screenful, type the space bar on your keyboard. There is no way to scroll back.

If you actually need to go back to an earlier screen, one way is to quit the program and redo the command again. To terminate the program before you reach the end of the file eg, if you have already found what you were looking for, or if you accidentally paged forward past the part you wanted to see and needed to start again , type "q" without the quotation marks to quit.

Alternatively, you can also click the "x" button on the top right hand side of the window in the usual way. While "more" is generally useful for viewing a file one screenful at a time, if you need to page up and down repeatedly, its inability to scroll back can be very frustrating.

In such a case, it may be worth the effort to save the output that "format-hex" produces as a text file, so that you can use a normal plain text editor like Notepad to view it.

This produces a file called "file. You can of course name the file anything you want. Both "file. Then open "file. This allows you to page up and down through the output as much as you like. Windows 7, 8, 8. Such a text file can then be viewed in any plain text editor , including Notepad, which comes with Windows. Click the Start menu and type "cmd". The words "Command Prompt" should appear at the top. This opens a command prompt window.

The exact words will be different on your computer, since you are unlikely to have the same Windows account name as me.