Install & Compatibility
Where this runs
tested against v1.11.0 · pip install
no network on importno background threads
Install × environment matrix
Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux
muslpy 3.10–3.95 runs
build_error
glibcpy 3.10–3.95 runs
installs and imports cleanly · install 8.9s · import 0.658s · 115MB
116MB installed
● package 116MB
Code
Verified usage
Verified import paths — ran on the pinned version, not inferred.
create_engine
✓ from sqlalchemy import create_engine
URL
✓ from snowflake.sqlalchemy import URL
✗ from sqlalchemy.url import URL
The Snowflake-specific URL constructor is part of the snowflake.sqlalchemy module, not directly from SQLAlchemy's base URL module.
This quickstart demonstrates how to establish a connection to Snowflake using `create_engine` with the `snowflake.sqlalchemy.URL` object. It then executes a simple query to retrieve the current Snowflake version. Remember to replace placeholder credentials with your actual Snowflake account details or set them as environment variables. It's crucial to properly close the connection and dispose of the engine.
import os
from sqlalchemy import create_engine, text
from snowflake.sqlalchemy import URL
# Replace with your Snowflake credentials or set them as environment variables
SNOWFLAKE_ACCOUNT = os.environ.get('SNOWFLAKE_ACCOUNT', 'your_account_identifier')
SNOWFLAKE_USER = os.environ.get('SNOWFLAKE_USER', 'your_user_login_name')
SNOWFLAKE_PASSWORD = os.environ.get('SNOWFLAKE_PASSWORD', 'your_password')
SNOWFLAKE_WAREHOUSE = os.environ.get('SNOWFLAKE_WAREHOUSE', 'your_warehouse')
SNOWFLAKE_DATABASE = os.environ.get('SNOWFLAKE_DATABASE', 'your_database')
SNOWFLAKE_SCHEMA = os.environ.get('SNOWFLAKE_SCHEMA', 'your_schema')
try:
engine = create_engine(
URL(
account=SNOWFLAKE_ACCOUNT,
user=SNOWFLAKE_USER,
password=SNOWFLAKE_PASSWORD,
database=SNOWFLAKE_DATABASE,
schema=SNOWFLAKE_SCHEMA,
warehouse=SNOWFLAKE_WAREHOUSE
)
)
with engine.connect() as connection:
result = connection.execute(text('SELECT current_version()')).fetchone()
print(f"Connected to Snowflake. Current version: {result[0]}")
except Exception as e:
print(f"Error connecting to Snowflake: {e}")
finally:
if 'engine' in locals():
engine.dispose() # Ensures all connections are closed.
Debug
Known issues
breakingThe default behavior of the division operator (`/`) in SnowflakeDialect changed in version 1.7.3. Previously, `/` was integer division; it is now float division, aligning with standard Python 3 behavior. Integer division is now `//`. A `force_div_is_floordiv` flag was added for backward compatibility, but it is slated for removal in future releases.fixReview code using division (`/`) and explicitly use `//` for integer division or `force_div_is_floordiv=True` in connection parameters, understanding it's a temporary workaround.
affects: >=1.7.3
gotchaSnowflake stores all case-insensitive object names (e.g., table, column names) in uppercase. SQLAlchemy, by default, considers lowercase object names as case-insensitive. This mismatch can lead to issues during schema reflection (e.g., `get_table_names`, `get_columns`) if object names are not consistently handled (e.g., quoted identifiers for case-sensitivity).fixUse consistent casing for object names in your SQLAlchemy models and queries. For case-sensitive identifiers, ensure they are properly quoted by SQLAlchemy or Snowflake. When reflecting, be aware of how SQLAlchemy handles returned names.
affects: All versions
gotchaIt is critical to explicitly close connections (`connection.close()`) before disposing of the engine (`engine.dispose()`). Failing to do so can prevent the underlying Snowflake Connector for Python from properly closing sessions, leading to resource leaks or unexpected behavior.fixAlways use `with engine.connect() as connection:` for managing connections or explicitly call `connection.close()` and `engine.dispose()` in a `finally` block to ensure proper resource cleanup.
affects: All versions
breakingCompatibility with `snowflake-connector-python` versions. For example, version 1.8.0 bumped the required `snowflake-connector-python` to be less than 5.0.0, and `v1.8.1` was yanked due to connector compatibility. Ensure your connector version is within the supported range for your `snowflake-sqlalchemy` version.fixCheck the `snowflake-sqlalchemy` release notes or `setup.py` for specific `snowflake-connector-python` version constraints and install a compatible version using `pip install "snowflake-connector-python<X.Y.Z"` if necessary.
affects: All versions, specifically 1.8.x and above.
gotchaSpecial characters like '%' or '@' in passwords or other connection parameters within a URL connection string must be URL-encoded to be parsed correctly by SQLAlchemy and the underlying connector.fixUse `urllib.parse.quote_plus()` or `urllib.parse.quote()` to encode special characters in connection string components, especially passwords.
affects: All versions
gotchaSchema reflection could cause crashes in version 1.9.0 when reflecting without specifying a schema, due to `None` arguments in internal schema resolution, or when `SHOW TABLES` returns unexpected results.fixUpgrade to a version beyond 1.9.0 if available, or explicitly specify the schema when performing reflection operations (`inspector.get_table_names(schema='your_schema')`).
affects: 1.9.0
breakingA '404 Not Found' error during connection or login to Snowflake (e.g., 'HttpError 404 Not Found: post your_account_identifier.snowflakecomputing.com') frequently indicates an incorrect Snowflake account identifier, an invalid region specification, or that the specified account does not exist at the given endpoint. This prevents the underlying Snowflake service from locating the requested resource for authentication.fixThoroughly verify the Snowflake account identifier used in your connection string (e.g., 'account.region' or 'account'). Ensure there are no typos, the correct region suffix is included if required, and that the account is active and accessible. Also, check for any network connectivity issues or proxy configurations that might be preventing successful resolution or access to the Snowflake endpoint.
affects: All versions
breakingBuilding `snowflake-connector-python` from source (e.g., in environments without pre-built wheels like Alpine Linux) requires C/C++ build tools. The `g++` compiler was not found during the wheel build process.fixEnsure that C/C++ build tools are installed in the environment. For Alpine Linux, run `apk add build-base` before attempting to install `snowflake-connector-python`.
affects: All versions that require building from source (e.g., when a pre-built wheel for the specific Python version/OS is not available).
Errors
Common errors & fixes
sqlalchemy.exc.NoSuchModuleError: Can't load plugin: sqlalchemy.dialects:snowflake
The `snowflake-sqlalchemy` package is not installed, or SQLAlchemy cannot find the `snowflake` dialect.
fixInstall the package using `pip install snowflake-sqlalchemy` and ensure your connection string starts with `snowflake://`.
sqlalchemy.exc.ArgumentError: Could not parse URL from string '...'
The connection string provided to `create_engine` does not conform to the expected URL format for `snowflake-sqlalchemy`, often due to missing components, incorrect delimiters, or unescaped characters.
fixEnsure the connection string strictly adheres to the format `snowflake://<user>:<password>@<account>/<database>/<schema>?warehouse=<warehouse>&role=<role>`, properly escaping special characters in passwords if necessary.
snowflake.connector.errors.ProgrammingError: Failed to connect to DB: <account_identifier>
A generic connection failure indicating issues with provided credentials, account identifier, or network accessibility as reported by the underlying Snowflake Connector.
fixVerify all connection parameters (username, password, account identifier, role, warehouse, database, schema) are correct and that your network allows access to Snowflake.
snowflake.connector.errors.ProgrammingError: Authenticator is not specified.
When using specific authentication methods (like external browser or Okta), the `authenticator` parameter is missing or incorrectly specified in the connection string.
fixAdd the `authenticator` parameter to the connection string with the correct value (e.g., `authenticator=externalbrowser` or `authenticator=https://<your_okta_account>.okta.com`).
Upgrade
Version history
1.11.0latest on PyPI · released Jul 8, 2026
Audit
Dependencies
SQLAlchemyrequiredCore ORM and database toolkit framework.
snowflake-connector-pythonrequiredThe underlying Python driver for Snowflake. Automatically installed with snowflake-sqlalchemy.
pandasoptionalOptional, for integrating with pandas DataFrames for easier data loading and manipulation.