the language level. For example Jinja2 treats the non- breaking space as valid whitespace inside expressions which requires knowledge of the encoding or operating on an Unicode string. For more details about depending on if autoescaping is active or not. volatile True if the compiler cannot evaluate some expressions at compile time. At runtime this should always be False. 2.16 Custom Tests Tests work like filters even if you are not intercepting the call. Jinja2 might internally call the method to evaluate expressions. 43 44 CHAPTER 4 Native Python Types The default Environment renders templates to strings

/ namedtuples Returning Clause Common Table Expressions Foreign Keys and Joins Query operators Three valued logic Adding user-defined operators Expressions SQL Functions SQL Helper Security and SQL Injection 1960-01-15 # Herb 1950-05-05 # Grandma L. 1935-03-01 Combining filter expressions Peewee supports arbitrarily-nested expressions. Let’s get all the people whose birthday was either: before 1940 (grandma) an object is not found in the database. def get_object_or_404(model, *expressions): try: return model.get(*expressions) except model.DoesNotExist: abort(404) Note To avoid having

through it. Guide to the various query operators describes how to construct queries and combine expressions. Field types table lists the various field types peewee supports and the parameters they accept Counting records Aggregating records Retrieving Scalar Values SQL Functions, Subqueries and “Raw expressions” Security and SQL Injection Window functions Retrieving row tuples / dictionaries / namedtuples namedtuples Returning Clause Query operators Three valued logic Adding user-defined operators Expressions Foreign Keys Traversing foreign keys Joining tables Implementing Many to Many Self-joins Performance

[https://pgexercises.com]. Guide to the various query operators describes how to construct queries and combine expressions. Field types table lists the various field types peewee supports and the parameters they accept Counting records Aggregating records Retrieving Scalar Values SQL Functions, Subqueries and “Raw expressions” Security and SQL Injection Window functions Retrieving row tuples / dictionaries / namedtuples namedtuples Returning Clause Query operators Three valued logic Adding user-defined operators Expressions Foreign Keys Traversing foreign keys Joining tables Implementing Many to Many Self-joins Performance

1960-01-15 # Herb 1950-05-05 # Grandma L. 1935-03-01 Combining filter expressions Peewee supports arbitrarily-nested expressions. Let’s get all the people whose birthday was either: • before 1940 (grandma) when an object is not found in the database. def get_object_or_404(model, *expressions): try: return model.get(*expressions) except model.DoesNotExist: abort(404) Note: To avoid having to frequently Contents: peewee Documentation, Release 3.6.0 We can also use the flags on the Post class to build expressions in queries: # Generates a WHERE clause that looks like: # WHERE (post.flags & 1 != 0) favorites

[https://pgexercises.com]. Guide to the various query operators describes how to construct queries and combine expressions. Field types table lists the various field types peewee supports and the parameters they accept Counting records Aggregating records Retrieving Scalar Values SQL Functions, Subqueries and “Raw expressions” Security and SQL Injection Window functions Retrieving row tuples / dictionaries / namedtuples namedtuples Returning Clause Query operators Three valued logic Adding user-defined operators Expressions Foreign Keys Traversing foreign keys Joining tables Implementing Many to Many Self-joins Performance

framework. Guide to the various query operators describes how to construct queries and combine expressions. Field types table lists the various field types peewee supports and the parameters they accept Self-joins Performance Techniques Query operators Three valued logic Adding user-defined operators Expressions SQL Functions SQL Helper Security and SQL Injection API Documentation Database Query-builder 1960-01-15 # Herb 1950-05-05 # Grandma L. 1935-03-01 Combining filter expressions Peewee supports arbitrarily-nested expressions. Let’s get all the people whose birthday was either: before 1940 (grandma)

website. • Guide to the various query operators describes how to construct queries and combine expressions. • Field types table lists the various field types peewee supports and the parameters they accept 1960-01-15 # Herb 1950-05-05 # Grandma L. 1935-03-01 Combining filter expressions Peewee supports arbitrarily-nested expressions. Let’s get all the people whose birthday was either: • before 1940 (grandma) when an object is not found in the database. def get_object_or_404(model, *expressions): try: return model.get(*expressions) except model.DoesNotExist: abort(404) To avoid having to frequently copy/paste

website. • Guide to the various query operators describes how to construct queries and combine expressions. • Field types table lists the various field types peewee supports and the parameters they accept 1960-01-15 # Herb 1950-05-05 # Grandma L. 1935-03-01 Combining filter expressions Peewee supports arbitrarily-nested expressions. Let’s get all the people whose birthday was either: • before 1940 (grandma) when an object is not found in the database. def get_object_or_404(model, *expressions): try: return model.get(*expressions) except model.DoesNotExist: abort(404) To avoid having to frequently copy/paste

framework. • Guide to the various query operators describes how to construct queries and combine expressions. • Field types table lists the various field types peewee supports and the parameters they accept 1960-01-15 # Herb 1950-05-05 # Grandma L. 1935-03-01 Combining filter expressions Peewee supports arbitrarily-nested expressions. Let’s get all the people whose birthday was either: • before 1940 (grandma) when an object is not found in the database. def get_object_or_404(model, *expressions): try: return model.get(*expressions) except model.DoesNotExist: abort(404) Note: To avoid having to frequently