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The Python Language Reference documentation Navigation index modules next previous Documentation This reference manual describes the syntax and core semantics of language It is terse but attempts to be exact complete non-essential built-in object types functions are described in Standard Library For an informal introduction see Tutorial C or programmers two additional manuals exist Extending Embedding Interpreter high-level picture how write a extension module API Manual interfaces available detail Introduction Alternate Implementations Notation Lexical analysis Line structure Other tokens Identifiers keywords Literals Operators Delimiters Data model Objects values standard type hierarchy Special method names Coroutines Execution Structure program Naming binding Exceptions import system span class pre importlib Packages Searching Loading Path Based Finder Replacing Package Relative Imports considerations for main Open issues References Expressions Arithmetic conversions Atoms Primaries Await expression power operator Unary arithmetic bitwise operations Binary Shifting Comparisons Boolean Assignment expressions Conditional Lambdas Expression lists Evaluation order Operator precedence Simple statements assert statement pass del return yield raise break continue global nonlocal Compound if while try with Function definitions Class Top-level components Complete programs File input Interactive Full Grammar specification Previous topic Editors IDEs Next Page Report Bug Show Source copy Copyright Software Foundation non-profit corporation Please donate Last updated on Nov Found bug Created using Sphinx