__float__ not called by 'float' on classes derived from str

[tonal]

BPO	5759
Nosy	@tonal, @benjaminp, @bitdancer
Files	issue5759-trunk-test.patch issue5759-py3k-test.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

Show more details

GitHub fields:

assignee = None
closed_at = <Date 2009-04-15.21:27:16.928>
created_at = <Date 2009-04-15.03:41:01.156>
labels = ['interpreter-core', 'type-bug']
title = "__float__ not called by 'float' on classes derived from str"
updated_at = <Date 2009-04-15.21:27:16.808>
user = 'https://github.com/tonal'

bugs.python.org fields:

activity = <Date 2009-04-15.21:27:16.808>
actor = 'benjamin.peterson'
assignee = 'none'
closed = True
closed_date = <Date 2009-04-15.21:27:16.928>
closer = 'benjamin.peterson'
components = ['Interpreter Core']
creation = <Date 2009-04-15.03:41:01.156>
creator = 'shura_zam'
dependencies = []
files = ['13690', '13691']
hgrepos = []
issue_num = 5759
keywords = ['patch']
message_count = 4.0
messages = ['85979', '85980', '85993', '86002']
nosy_count = 3.0
nosy_names = ['shura_zam', 'benjamin.peterson', 'r.david.murray']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'needs patch'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue5759'
versions = ['Python 2.6', 'Python 3.0', 'Python 3.1', 'Python 2.7']

[tonal]

Test case:
[code]
class S:
def __init__(self, v):
self.data = v

    def __int__(self):
        print("S.INT called")
        return int(str(self.data))
    def __float__(self):
        print("S.FLOAT called")
        return float(str(self.data))
        

class T(str):
    def __int__(self):
        print("T.INT called")
        return int(str(self))
    def __float__(self):
        print("T.FLOAT called")
        return float(str(self))

class U(unicode):
    def __int__(self):
        print("U.INT called")
        return int(unicode(self))
    def __float__(self):
        print("U.FLOAT called")
        return float(unicode(self))


i = S("123")
print(type(int(i)))
print(type(float(i)))

i = T("123")
print(type(int(i)))
print(type(float(i))) # <<< CALLS __float__ NOTHING

i = U("123")
print(type(int(i)))
print(type(float(i)))
[/code]
Output:
[code]
S.INT called
<type 'int'>
S.FLOAT called
<type 'float'>
T.INT called
<type 'int'>
<type 'float'>
U.INT called
<type 'int'>
U.FLOAT called
<type 'float'>
[/code]

[tonal]

read from http://community.livejournal.com/ru_python/232808.html

[bitdancer]

I have confirmed this in trunk and py3k, unit tests attached.

[benjaminp]

Thanks for the tests. Fixed in r71627.