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exec_prefix
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Directory where platform-dependent Python files are installed
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String containing the name of the interpreter executable
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An object representing the settings of different command-line options supplied to the Python interpreter itselfThe following table lists the attributes of flags along with the corresponding command-line option that turns the flag onThese attributes are readonly
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Attribute
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flagsdebug flagspy3k_warning flagsdivision_warning flagsdivision_new flagsinspect flagsinteractive flagsoptimize flagsdont_write_bytecode flagsno_site flagsignore_environment flagstabcheck flagsverbose flagsunicode
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-d -3 -Q -Qnew -i -i -O or -OO -B -S -E -t or -tt -v -U
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float_info
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An object that holds information about internal representation of floating-point numbersThe values of these attributes are taken from the floath C header file
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Difference between 10 and the next largest float float_infodig Number of decimal digits that can be represented without any changes after rounding float_infomant_dig Number of digits that can be represented using the numeric base specified in float_inforadix float_infomax Maximum floating-point number float_infomax_exp Maximum exponent in the numeric base specified in float_inforadix float_infomax_10_exp Maximum exponent in base 10 float_infomin Minimum positive floating-point value float_infomin_exp Minimum exponent in the numeric base specified in float_inforadix float_infomin_10_exp Minimum exponent in base 10 float_inforadix Numeric base used for exponents float_inforounds Rounding behavior (-1 undetermined, 0 towards zero, 1 nearest, 2 towards positive infinity, 3 towards negative infinity)
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Integer whose hexadecimal representation encodes the version information contained in sysversion_infoThe value of this integer is always guaranteed to increase with newer versions of the interpreter
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last_type, last_value, last_traceback
These variables are set when an unhandled exception is encountered and the interpreter prints an error message last_type is the last exception type, last_value is the last exception value, and last_traceback is a stack trace Note that the use of these variables is not thread-safe sysexc_info() should be used instead
maxint
Largest integer supported by the integer type (Python 2 only)
maxsize
Largest integer value supported by the C size_t datatype on the systemThis value determines the largest possible length for strings, lists, dicts, and other built-in types
maxunicode
Integer that indicates the largest Unicode code point that can be representedThe default value is 65535 for the 16-bit UCS-2 encoding A larger value will be found if Python has been configured to use UCS-4
modules
Dictionary that maps module names to module objects
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13 Python Runtime Services
path
List of strings specifying the search path for modulesThe first entry is always set to the directory in which the script used to start Python is located (if available) Refer to 8, Iterators and Generators
platform
Platform identifier string, such as 'linux-i386'
prefix
Directory where platform-independent Python files are installed
ps1, ps2
Strings containing the text for the primary and secondary prompts of the interpreter Initially, ps1 is set to '>>> ' and ps2 is set to ' 'The str() method of whatever object is assigned to these values is evaluated to generate the prompt text
py3kwarning
Flag set to True in Python 2 when the interpreter is run with the -3 option
stdin, stdout, stderr
File objects corresponding to standard input, standard output, and standard error stdin is used for the raw_input() and input() functions stdout is used for print and the prompts of raw_input() and input() stderr is used for the interpreter s prompts and error messagesThese variables can be assigned to any object that supports a write() method operating on a single string argument
_ _stdin_ _, _ _stdout_ _, _ _stderr_ _
File objects containing the values of stdin, stdout, and stderr at the start of the interpreter
tracebacklimit
Maximum number of levels of traceback information printed when an unhandled exception occursThe default value is 1000 A value of 0 suppresses all traceback information and causes only the exception type and value to be printed
version
Version string
version_info
Version information represented as a tuple (major, minor, micro, releaselevel, serial) All values are integers except releaselevel, which is the string 'alpha', 'beta', 'candidate', or 'final'
warnoptions
List of warning options supplied to the interpreter with the W command-line option
winver
The version number used to form registry keys on Windows
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Functions
The following functions are available:
_clear_type_cache()
Clears the internal type cacheTo optimize method lookups, a small 1024-entry cache of recently used methods is maintained inside the interpreterThis cache speeds up repeated method lookups especially in code that has deep inheritance hierarchies Normally, you don t need to clear this cache, but you might do so if you are trying to track down a really tricky memory reference counting issue For example, if a method in the cache was holding a reference to an object that you were expecting to be destroyed
_current_frames()
Returns a dictionary mapping thread identifiers to the topmost stack frame of the executing thread at the time of callThis information can be useful in writing tools related to thread debugging (that is, tracking down deadlock) Keep in mind that the values returned by this function only represent a snapshot of the interpreter at the time of call Threads may be executing elsewhere by the time you look at the returned data
displayhook([value])
This function is called to print the result of an expression when the interpreter is running in interactive mode By default, the value of repr(value) is printed to standard output and value is saved in the variable _ _builtin_ __ displayhook can be redefined to provide different behavior if desired
excepthook(type,value,traceback)
This function is called when an uncaught exception occurs type is the exception class, value is the value supplied by the raise statement, and traceback is a traceback objectThe default behavior is to print the exception and traceback to standard error However, this function can be redefined to provide alternative handling of uncaught exceptions (which may be useful in specialized applications such as debuggers or CGI scripts)
exc_clear()
Clears all information related to the last exception that occurred It only clears information specific to the calling thread
exc_info()
Returns a tuple (type, value, traceback) containing information about the exception that s currently being handled type is the exception type, value is the exception parameter passed to raise, and traceback is a traceback object containing the call stack at the point where the exception occurred Returns None if no exception is currently being handled
exit([n])
Exits Python by raising the SystemExit exception n is an integer exit code indicating a status code A value of 0 is considered normal (the default); nonzero values are considered abnormal If a noninteger value is given to n, it s printed to sysstderr and an exit code of 1 is used