浅析Python基础-流程控制
Python编程语言的作用非常强大，而且其应用方便的特点也对开发人员起到了非常大的作用。在这里我们就可以先从Python流程控制关键字的相关概念开始了解，从而初步掌握这一语言的特点。
Python是一种解释型、面向对象、动态数据类型的高级程序设计语言。
Python由Guido van Rossum于1989年底发明，第一个公开发行版发行于1991年。
像Perl语言一样, Python 源代码同样遵循 GPL(GNU General Public License)协议。
哪门语言都会有流程控制，即if switch while等语句。
应该是每种语言路程控制的原理、作用都是相近的，只是表达形式有所差异而已。
今天就跟大家分享一个Python中的条件、循环等语句。
这里最主要不再用大括号了，而是代码块。
首先需要注意的是if和else之后的冒号：
if
<code class="hljs lua">name = raw_input("What is your name? ")
if(name.endswith('Gumby')):
print 'Hello, Mr. Gumby'</code>else
<code class="hljs lua">name = raw_input("What is your name? ")
if(name.endswith('Gumby')):
print 'Hello, Mr. Gumby'
else:
print 'Hello, Stranger'</code>elif
这里需要注意一下，我们再C++中使用的else if语句，在Python中直接写作：elif
<code class="hljs python">num = input('Enter a number: ')
if num >0 :
print 'The number is positive'
elif num < 0:
print 'The number is negative'
else:
print '0'</code>while
<code class="hljs lua">x = 1 while x <= 100 print x x += 1</code>
for循环
能使用for，就尽量避免使用while
<code class="hljs livecodeserver">words = ['this', 'is', 'an', 'ex', 'parrot'] for word in words: print word</code>
for遍历字典
<code class="hljs lua">d = {'x':1, 'y':2, 'z':3}
for key in d:
print key, 'corresponds to', d[key]</code>zip并行迭代
<code class="hljs lua">names = ['name', 'beth', 'george', 'damo'] ages = [12, 45, 32, 99] for name, age in zip(names, ages): print name, 'is', age, 'years old'</code>
break跳出循环
continue
好了，关于Python基础-流程控制小编就给大家介绍到这里，希望对大家有所帮助！
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