Documentation example doesn't work

[PabloCastellano]

From https://neo4j.com/docs/api/python-driver/current/#example

This line:

>>> for friend, in session.run("MATCH (a:Person {name:'Alice'})-[:KNOWS]->(x) RETURN x"):
...     print('Alice says, "hello, %s"' % friend["name"])
... 
Traceback (most recent call last):
  File "<input>", line 2, in <module>
    print('Alice says, "hello, %s"' % friend["name"])
TypeError: string indices must be integers

[EmilStenstrom]

This problem is likely just an extra comma after friend:

for friend, in session.run(...)

[liutec]

The comma is not extra.

for friend, in session.run("MATCH (a:Person {name:'Alice'})-[:KNOWS]->(x) RETURN x"):
    print('Alice says, "hello, %s"' % friend["name"])

is equivalent to:

for record in session.run("MATCH (a:Person {name:'Alice'})-[:KNOWS]->(x) RETURN a, x"):
    friend, = record
    print('Alice says, "hello, %s"' % friend["name"])

Record.__iter__ will be called in order to assign the first returned value (x) to friend.

It's use is to extract returned values like so:

for a, x in session.run("MATCH (a:Person {name:'Alice'})-[:KNOWS]->(x) RETURN a,x"):
    print('%s says, "hello, %s"' % (a["name"], x["name"]))

instead of having to address them explicitly in the record:

for record in session.run("MATCH (a:Person {name:'Alice'})-[:KNOWS]->(x) RETURN a,x"):
    print('%s says, "hello, %s"' % (record["a"]["name"], record["x"]["name"]))

The problem is that Record.__iter__ returns iter(self._keys) instead of iter(self._values).

I believe this is a flaw in the implementation of the Record class.

neo4j-python-driver/neo4j/v1/session.py

Line 477 in f7c2f77

return iter(self._keys)

I may be wrong, I just started to evaluate this library, but I see no point in providing iteration support to fetch the already known variable names instead of the actual values.

[technige]

Fixed in #111