We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
French IBAN should be 27 char of length
* Faker version: 4.1.1

### Steps to reproduce

```
import faker
from faker import Faker
fake = Faker('fr_FR')
fr_iban = fake.iban()
fr_iban
'FR96505438725498141631455686'
len(fr_iban)
28
```


### Expected behavior

```
>>> len(fr_iban)
27
```

[As stated on wikipedia in France row](https://en.wikipedia.org/wiki/International_Bank_Account_Number#IBAN_formats_by_country)

### Actual behavior

```
>>> len(fr_iban)
28
```


--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `faker/providers/bank/fr_FR/__init__.py`
Content:
```
1 from .. import Provider as BankProvider
2 
3 
4 class Provider(BankProvider):
5     bban_format = '########################'
6     country_code = 'FR'
7
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/faker/providers/bank/fr_FR/__init__.py b/faker/providers/bank/fr_FR/__init__.py
--- a/faker/providers/bank/fr_FR/__init__.py
+++ b/faker/providers/bank/fr_FR/__init__.py
@@ -2,5 +2,5 @@
 
 
 class Provider(BankProvider):
-    bban_format = '########################'
+    bban_format = '#######################'
     country_code = 'FR'

{"golden_diff": "diff --git a/faker/providers/bank/fr_FR/__init__.py b/faker/providers/bank/fr_FR/__init__.py\n--- a/faker/providers/bank/fr_FR/__init__.py\n+++ b/faker/providers/bank/fr_FR/__init__.py\n@@ -2,5 +2,5 @@\n \n \n class Provider(BankProvider):\n-    bban_format = '########################'\n+    bban_format = '#######################'\n     country_code = 'FR'\n", "issue": "French IBAN should be 27 char of length\n* Faker version: 4.1.1\r\n\r\n### Steps to reproduce\r\n\r\n```\r\nimport faker\r\nfrom faker import Faker\r\nfake = Faker('fr_FR')\r\nfr_iban = fake.iban()\r\nfr_iban\r\n'FR96505438725498141631455686'\r\nlen(fr_iban)\r\n28\r\n```\r\n\r\n\r\n### Expected behavior\r\n\r\n```\r\n>>> len(fr_iban)\r\n27\r\n```\r\n\r\n[As stated on wikipedia in France row](https://en.wikipedia.org/wiki/International_Bank_Account_Number#IBAN_formats_by_country)\r\n\r\n### Actual behavior\r\n\r\n```\r\n>>> len(fr_iban)\r\n28\r\n```\r\n\n", "before_files": [{"content": "from .. import Provider as BankProvider\n\n\nclass Provider(BankProvider):\n    bban_format = '########################'\n    country_code = 'FR'\n", "path": "faker/providers/bank/fr_FR/__init__.py"}], "after_files": [{"content": "from .. import Provider as BankProvider\n\n\nclass Provider(BankProvider):\n    bban_format = '#######################'\n    country_code = 'FR'\n", "path": "faker/providers/bank/fr_FR/__init__.py"}]}