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55 | <H1><A NAME="SECTION0010100000000000000000"></A><A NAME="programs"></A> | |
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58 | 8.1 Complete Python programs | |
59 | </H1> | |
60 | ||
61 | <P> | |
62 | While a language specification need not prescribe how the language | |
63 | interpreter is invoked, it is useful to have a notion of a complete | |
64 | Python program. A complete Python program is executed in a minimally | |
65 | initialized environment: all built-in and standard modules are | |
66 | available, but none have been initialized, except for <tt class="module">sys</tt> | |
67 | (various system services), <tt class="module">__builtin__</tt> (built-in functions, | |
68 | exceptions and <code>None</code>) and <tt class="module">__main__</tt>. The latter is used | |
69 | to provide the local and global namespace for execution of the | |
70 | complete program. | |
71 | <a id='l2h-623' xml:id='l2h-623'></a> | |
72 | ||
73 | <P> | |
74 | The syntax for a complete Python program is that for file input, | |
75 | described in the next section. | |
76 | ||
77 | <P> | |
78 | The interpreter may also be invoked in interactive mode; in this case, | |
79 | it does not read and execute a complete program but reads and executes | |
80 | one statement (possibly compound) at a time. The initial environment | |
81 | is identical to that of a complete program; each statement is executed | |
82 | in the namespace of <tt class="module">__main__</tt>. | |
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84 | ||
85 | <P> | |
86 | Under <span class="Unix">Unix</span>, a complete program can be passed to the interpreter in | |
87 | three forms: with the <b class="programopt">-c</b> <var>string</var> command line option, as a | |
88 | file passed as the first command line argument, or as standard input. | |
89 | If the file or standard input is a tty device, the interpreter enters | |
90 | interactive mode; otherwise, it executes the file as a complete | |
91 | program. | |
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130 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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