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Python Programming: An Introduction to Computer Science

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Python programming : An Introduction to Computer Science Chapter 4 (End of Chapter) File IO Coming up: File Processing 1 File Processing !The process of opening a file involves associating a file on disk with a variable. !We can manipulate the file by manipulating this variable. !Read from the file !Write to the file File Processing !When done with the file, it needs to be closed. Closing the file causes any outstanding operations and other bookkeeping for the file to be completed. !In some cases, not properly closing a file could result in data loss. File Processing Sequence 1.!Open the file 2.!Read from the file 3.!Close the file File Processing !Working with text files in Python !Associate a file with a variable using the open function <filevar> = open(<name>, <mode>) !Name is a string with the actual file name on the disk. The mode is either r or w depending on whether we are reading or writing the file.

Python Programming: An Introduction to Computer Science Chapter 4 (End of Chapter) File IO Coming up: File Processing 1 . File Processing •!The process of opening a file involves associating a file on disk with a variable. •!We can manipulate the file by manipulating this variable.

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