File input and output and conditionals - Borenstein Lab
File input and output and conditionals
Genome 559: Introduction to Statistical and Computational Genomics
Prof. James H. Thomas
Opening files
? The built-in open() command returns a file object:
= open(, )
? Python will read, write or append to a file according to the access type requested: ? 'r' = read ? 'w' = write (will replace the file if it exists) ? 'a' = append (appends to an existing file)
? For example, open for reading a file called "hello.txt":
>>> myFile = open('hello.txt', 'r')
Reading the whole file
? You can read the entire content of the file into a single string. If the file content is the text "Hello, world!\n":
>>> myString = myFile.read() >>> print myString Hello, world!
>>>
why is there a blank line here?
Reading the whole file
? Now add a second line to the file ("How ya doin'?\n") and try again.
>>> myFile = open("hello.txt", "r") >>> myString = myFile.read() >>> print myString Hello, world! How ya doin'?
>>>
Reading the whole file
? Alternatively, you can read the file into a list of strings:
>>> myFile = open("hello.txt", "r")
>>> myStringList = myFile.readlines()
>>> print myStringList
['Hello, world!\n', 'How ya doin'?\n']
>>> print myStringList[1]
How ya doin'?
notice that each line has the newline
character at the end
this file method returns a list of strings, one for
each line in the file
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