Python Programming: An Introduction to …
嚜燕ython 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.
每!Read from the file
每!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
每!Associate a file with a variable using the
open function
= open(, )
每!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. ※a§ for appending to an
existing file. (※a§ will also create a nonexistent file)
每!Infile = open(※numbers.dat§, ※r§)
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