增加python文档

web/python-docs/_sources/library/crypto.rst.txt

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+.. _crypto:
+
+**********************
+Cryptographic Services
+**********************
+
+.. index:: single: cryptography
+
+The modules described in this chapter implement various algorithms of a
+cryptographic nature.  They are available at the discretion of the installation.
+On Unix systems, the :mod:`crypt` module may also be available.
+Here's an overview:
+
+
+.. toctree::
+
+   hashlib.rst
+   hmac.rst
+   secrets.rst