14 | 9月 | 2015 | Leslie的小屋

Python Snippets （4）

1. compile

```
#!/usr/bin/env python
```
```
 
```

eval_code = compile("100 + 200", "", "eval")

```
print eval(eval_code)
```
```
 
```

single_code = compile("print 'Hello World'", '', "single")

```
exec single_code
```
```
 
```
```
exec_code = compile("""
```
```
req = input('Count how many numbers?')
```
```
for eachNum in range(req):
```
```
    print eachNum
```
```
            """, '','exec')
```
```
exec exec_code
```

2.

```
#! /usr/bin/env python
```
```
 
```
```
def foo():
```
```
    return True
```
```
def bar():
```
```
    'bar() does not much'
```
```
    return True
```
```
foo.__doc__ = 'foo() does not do much'
```
```
foo.tester = '''
```
```
if foo():
```
```
    print 'PASSED'
```
```
else:
```
```
    print 'FAILED'
```
```
'''
```
```
 
```
```
for eachAttr in dir():
```

    obj = eval(eachAttr) #convert the string to the object

```
    if isinstance(obj, type(foo)):
```
```
        if hasattr(obj, '__doc__'):
```

            print '\n Function "%s" has a doc string:\n\t%s' %(eachAttr, obj.__doc__)

```
        if hasattr(obj, 'tester'):
```

            print 'Function "%s" has a tester...executing ' %eachAttr

            exec obj.tester #to execute the strings

```
        else:
```

            print 'Funciton "%s" has no tester...skipping' %eachAttr

```
    else:
```

        print '"%s" is not a Function' %eachAttr

print '________________dir()__________________'

```
print dir()
```

3.
globals/locals[……]