prompt: 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()
  
  ```
  
golden_diff: 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'
  
verification_info: {"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"}]}