First, the processing path
1, the variable Magic
2, os module
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the os.path.join () Method: paths connecting two parts, combined into a complete path
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Other methods:
| method | description |
|---|---|
| os.getcwd() | Displays the current working directory |
| os.chdir（） | Change the working directory |
| os.mkdir() | Create a new directory in a directory |
| os.rmdir () | Delete a directory |
| os.listdir () | Get a directory listing of the current path, returns a list of data format |
| os.path.isdir () | Determine whether the current file is a directory, returns a Boolean value |
| os.path.isfile（） | Determine whether the current file is a file and returns a Boolean value |
Second, exception handling
1, exception analysis
2, abnormal capture
Captures a single exception type
the try :
# Print (A) #NameError int ( "A" ) #ValueError the except NameError: Print ( " catch eligible to heterologous constant " )
At this time, can not capture a ValueError , capture can only capture single exception corresponding exception, not the other types of capture
Capturing more than one exception type
One could write except statements, comprising a plurality of types of abnormality, when an abnormality to be captured
Capturing multiple exception types (different exception types require different processing to do), a reception anomaly type with variable
捕获多个异常类型（不同的异常类型，做统一处理），except后面可以接多个异常类型
带有万能异常基类的代码Exception
所有异常的基类BaseExcption
3、assert断言和抛出异常raise
assert:比较两个数据是否一致，raise主动抛出一个异常
res=1
excepted=2
try:
assert res==excepted
except AssertionError as e:
print('用例未通过')
raise e