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authorGuido van Rossum <guido@python.org>1997-11-20 15:42:18 (GMT)
committerGuido van Rossum <guido@python.org>1997-11-20 15:42:18 (GMT)
commitf5831ae92e0c0689a14da7f636ba471c6209c1ca (patch)
tree4b74ddaf4ee989ad406f194e5430a0ccdafe43c5 /Misc
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New blurb, derived from my Handbook of Object Technology abstract.
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-What is Python?
----------------
+What is Python? Executive Summary
+----------------------------------
-Python is an interpreted, interactive, object-oriented programming
-language. It incorporates modules, exceptions, dynamic typing, very
-high level dynamic data types, and classes. Python combines
-remarkable power with very clear syntax. It has interfaces to many
-system calls and libraries, as well as to various window systems, and
-is extensible in C or C++. It is also usable as an extension language
-for applications that need a programmable interface. Finally, Python
-is portable: it runs on many brands of UNIX, on the Mac, and on
-MS-DOS.
+Python is an interpreted, object-oriented, high-level programming
+language with dynamic semantics. Its high-level built in data
+structures, combined with dynamic typing and dynamic binding, make it
+very attractive for Rapid Application Development, as well as for use
+as a scripting or glue language to connect existing components
+together. Python's simple, easy to learn syntax emphasizes
+readability and therefore reduces the cost of program maintenance.
+Python supports modules and packages, which encourages program
+modularity and code reuse. The Python interpreter and the extensive
+standard library are available in source or binary form without charge
+for all major platforms, and can be freely distributed.
-As a short example of what Python looks like, here's a script to
-print prime numbers (not blazingly fast, but readable!). When this
-file is made executable, it is callable directly from the UNIX shell
-(if your system supports #! in scripts and the python interpreter is
-installed at the indicated place).
-
-#!/usr/local/bin/python
-
-# Print prime numbers in a given range
-
-def main():
- import sys
- min, max = 2, 0x7fffffff
- if sys.argv[1:]:
- min = int(eval(sys.argv[1]))
- if sys.argv[2:]:
- max = int(eval(sys.argv[2]))
- primes(min, max)
-
-def primes(min, max):
- if 2 >= min: print 2
- primes = [2]
- i = 3
- while i <= max:
- for p in primes:
- if i%p == 0 or p*p > i: break
- if i%p <> 0:
- primes.append(i)
- if i >= min: print i
- i = i+2
-
-main()
+Often, programmers fall in love with Python because of the increased
+productivity it provides. Since there is no compilation step, the
+edit-test-debug cycle is incredibly fast. Debugging Python programs is
+easy: a bug or bad input will never cause a segmentation
+fault. Instead, when the interpreter discovers an error, it raises an
+exception. When the program doesn't catch the exception, the
+interpreter prints a stack trace. A source level debugger allows
+inspection of local and global variables, evaluation of arbitrary
+expressions, setting breakpoints, stepping through the code a line at
+a time, and so on. The debugger is written in Python itself,
+testifying to Python's introspective power. On the other hand, often
+the quickest way to debug a program is to add a few print statements
+to the source: the fast edit-test-debug cycle makes this simple
+approach very effective.