CODEWITHSUNDEEP
pythonpython-3.x
dcrearer
dcrearer

Reputation: 2072

Python 3.4 support of print operations with redirectors >>

I'm going through some examples from a text book. The source code below fails with the following Traceback:

Traceback (most recent call last):
  File "make_db_file.py", line 39, in <module>
    storeDbase(db)
  File "make_db_file.py", line 12, in storeDbase
    print >> dbfile, key
TypeError: unsupported operand type(s) for >>: 'builtin_function_or_method' and '_io.TextIOWrapper'

def storeDbase(db, dbfilename=dbfilename):
    "formatted dump of database to flat file"
    import sys
    dbfile = open(dbfilename, 'w')
    for key in db:
        print >> dbfile, key
        for (name, value) in db[key].items():
            print >> dbfile, name + RECSEP + repr(value)
    print >> dbfile, ENDDB
    dbfile.close()

When I run this code under Python 2.7 it works as expected. Can someone please point me in the right direction. What has changed in the print function that prevents this from working in Python 3.4?

Upvotes: 2

Views: 56

Answers (1)

Delgan
Delgan

Reputation: 19677

In Python 3, print() is a function and not a keyword. So, if you want to redirect the output, you have to set the optional parameter file (default value is sys.stdout), like this:

print(key, file=dbfile)

Take a look at the Print is a function paragraph, from the official documentation about what changed in Python 3.

Upvotes: 4

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