{"library":"mmcif","title":"mmCIF Core Access Library","description":"The `mmcif` Python library, current version 1.1.0, provides a comprehensive API for interacting with macromolecular Crystallographic Information File (mmCIF) and BinaryCIF data. Developed by the RCSB PDB, it includes native Python functionality and leverages pybind11 wrappers for accelerated I/O operations from a C++ core library. It is designed for reading, manipulating, and exporting structural biology data in mmCIF format and is actively maintained with updates.","language":"python","status":"active","last_verified":"Thu May 14","install":{"commands":["pip install mmcif"],"cli":null},"imports":["from rcsb.utils.io.MarshalUtil import MarshalUtil"],"auth":{"required":false,"env_vars":[]},"quickstart":{"code":"import os\nfrom rcsb.utils.io.MarshalUtil import MarshalUtil\n\n# Create a MarshalUtil instance for I/O operations\nmU = MarshalUtil()\n\n# Define a public mmCIF file URL (e.g., from RCSB PDB)\nmmcif_url = \"https://files.rcsb.org/download/1ema.cif\"\n\n# Load data from the URL. The library can handle both local paths and URLs.\ndataContainerList = mU.load(mmcif_url, contentType=\"mmcif\")\n\nif dataContainerList:\n    # An mmCIF file can contain multiple data blocks; typically, we access the first one\n    dataContainer = dataContainerList[0]\n\n    print(f\"Data block ID: {dataContainer.getName()}\")\n\n    # Access a specific data category, e.g., '_entity'\n    entity_category = dataContainer.getObj(\"entity\")\n\n    if entity_category:\n        print(f\"\\nFound {entity_category.getRowCount()} entities:\")\n        for i in range(entity_category.getRowCount()):\n            pdbx_description = entity_category.getValue(\"pdbx_description\", i)\n            type_val = entity_category.getValue(\"type\", i)\n            print(f\"  - Entity {i+1}: Type='{type_val}', Description='{pdbx_description}'\")\n    else:\n        print(\"'_entity' category not found in the mmCIF file.\")\nelse:\n    print(f\"Failed to load data from {mmcif_url}. Please check the URL and network connection.\")","lang":"python","description":"This quickstart demonstrates how to read an mmCIF file from a URL, access its data blocks, and extract information from a specific category using the `MarshalUtil` 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