2020-10-19 21:08:55

docs/da/074.md

@@ -1,6 +1,6 @@
 # with 语句和上下文管理器
 
-```
+```py
 # create/aquire some resource
 ...
 try:
@@ -18,7 +18,7 @@ finally:
 
 In [1]:
 
-```
+```py
 with open('my_file', 'w') as fp:
     # do stuff with fp
     data = fp.write("Hello world")
@@ -29,7 +29,7 @@ with open('my_file', 'w') as fp:
 
 In [2]:
 
-```
+```py
 fp = open('my_file', 'w')
 try:
     # do stuff with f
@@ -43,7 +43,7 @@ finally:
 
 其基本用法如下：
 
-```
+```py
 with <expression>:
     <block>
 ```
@@ -52,13 +52,13 @@ with <expression>:
 
 In [3]:
 
-```
+```py
 print fp.__enter__
 print fp.__exit__
 
 ```
 
-```
+```py
 <built-in method __enter__ of file object at 0x0000000003C1D540>
 <built-in method __exit__ of file object at 0x0000000003C1D540>
 
@@ -70,7 +70,7 @@ print fp.__exit__
 
 In [4]:
 
-```
+```py
 class ContextManager(object):
 
     def __enter__(self):
@@ -85,13 +85,13 @@ class ContextManager(object):
 
 In [5]:
 
-```
+```py
 with ContextManager():
     print "  Inside the with statement"
 
 ```
 
-```
+```py
 Entering
   Inside the with statement
 Exiting
@@ -102,19 +102,19 @@ Exiting
 
 In [6]:
 
-```
+```py
 with ContextManager():
     print 1/0
 
 ```
 
-```
+```py
 Entering
 Exiting
 
 ```
 
-```
+```py
 ---------------------------------------------------------------------------
 ZeroDivisionError                         Traceback (most recent call last)
 <ipython-input-6-b509c97cb388> in <module>()
@@ -130,7 +130,7 @@ ZeroDivisionError: integer division or modulo by zero
 
 In [7]:
 
-```
+```py
 class ContextManager(object):
 
     def __enter__(self):
@@ -146,13 +146,13 @@ class ContextManager(object):
 
 In [8]:
 
-```
+```py
 with ContextManager() as value:
     print value
 
 ```
 
-```
+```py
 Entering
 my value
 Exiting
@@ -163,21 +163,21 @@ Exiting
 
 In [9]:
 
-```
+```py
 fp = open('my_file', 'r')
 print fp.__enter__()
 fp.close()
 
 ```
 
-```
+```py
 <open file 'my_file', mode 'r' at 0x0000000003B63030>
 
 ```
 
 In [10]:
 
-```
+```py
 import os
 os.remove('my_file')
 
@@ -187,7 +187,7 @@ os.remove('my_file')
 
 In [11]:
 
-```
+```py
 class ContextManager(object):
 
     def __enter__(self):
@@ -201,13 +201,13 @@ class ContextManager(object):
 
 In [12]:
 
-```
+```py
 with ContextManager() as value:
     print value
 
 ```
 
-```
+```py
 Entering
 <__main__.ContextManager object at 0x0000000003D48828>
 Exiting
@@ -220,7 +220,7 @@ Exiting
 
 In [13]:
 
-```
+```py
 class ContextManager(object):
 
     def __enter__(self):
@@ -237,20 +237,20 @@ class ContextManager(object):
 
 In [14]:
 
-```
+```py
 with ContextManager():
     print 1/0
 
 ```
 
-```
+```py
 Entering
 Exiting
   Exception: integer division or modulo by zero
 
 ```
 
-```
+```py
 ---------------------------------------------------------------------------
 ZeroDivisionError                         Traceback (most recent call last)
 <ipython-input-14-b509c97cb388> in <module>()
@@ -264,7 +264,7 @@ ZeroDivisionError: integer division or modulo by zero
 
 In [15]:
 
-```
+```py
 class ContextManager(object):
 
     def __enter__(self):
@@ -280,13 +280,13 @@ class ContextManager(object):
 
 In [16]:
 
-```
+```py
 with ContextManager():
     print 1/0
 
 ```
 
-```
+```py
 Entering
 Exiting
  Exception suppresed: integer division or modulo by zero
@@ -301,7 +301,7 @@ Exiting
 
 In [17]:
 
-```
+```py
 class Transaction(object):
 
     def __init__(self, connection):
@@ -324,7 +324,7 @@ class Transaction(object):
 
 In [18]:
 
-```
+```py
 import sqlite3 as db
 connection = db.connect(":memory:")
 
@@ -344,7 +344,7 @@ with Transaction(connection) as cursor:
 
 In [19]:
 
-```
+```py
 with Transaction(connection) as cursor:
     cursor.executemany("""INSERT OR REPLACE INTO addresses VALUES (?, ?, ?, ?, ?, ?)""", [
         (0, '515 Congress Ave', 'Austin', 'Texas', 'USA', '78701'),
@@ -359,7 +359,7 @@ with Transaction(connection) as cursor:
 
 In [20]:
 
-```
+```py
 with Transaction(connection) as cursor:
     cursor.execute("""INSERT OR REPLACE INTO addresses VALUES (?, ?, ?, ?, ?, ?)""",
         (4, '2100 Pennsylvania Ave', 'Washington', 'DC', 'USA', '78701'),
@@ -368,7 +368,7 @@ with Transaction(connection) as cursor:
 
 ```
 
-```
+```py
 ---------------------------------------------------------------------------
 Exception                                 Traceback (most recent call last)
 <ipython-input-20-ed8abdd56558> in <module>()
@@ -383,14 +383,14 @@ Exception: out of addresses
 
 In [21]:
 
-```
+```py
 cursor.execute("SELECT * FROM addresses")
 for row in cursor:
     print row
 
 ```
 
-```
+```py
 (0, u'515 Congress Ave', u'Austin', u'Texas', u'USA', u'78701')
 (1, u'245 Park Avenue', u'New York', u'New York', u'USA', u'10167')
 (2, u'21 J.J. Thompson Ave.', u'Cambridge', None, u'UK', u'CB3 0FA')
@@ -406,7 +406,7 @@ for row in cursor:
 
 In [23]:
 
-```
+```py
 from contextlib import closing
 import urllib
 
@@ -417,7 +417,7 @@ print html[:100]
 
 ```
 
-```
+```py
 <!DOCTYPE html><!--STATUS OK--><html><head><meta http-equiv="content-type" content="text/html;charse
 
 ```
@@ -426,7 +426,7 @@ print html[:100]
 
 In [24]:
 
-```
+```py
 from contextlib import contextmanager
 
 @contextmanager
@@ -440,7 +440,7 @@ with my_contextmanager():
 
 ```
 
-```
+```py
 Enter
   Inside the with statement
 Exit
@@ -453,7 +453,7 @@ Exit
 
 In [25]:
 
-```
+```py
 @contextmanager
 def my_contextmanager():
     print "Enter"
@@ -465,7 +465,7 @@ with my_contextmanager() as value:
 
 ```
 
-```
+```py
 Enter
 my value
 Exit
@@ -476,7 +476,7 @@ Exit
 
 In [26]:
 
-```
+```py
 @contextmanager
 def my_contextmanager():
     print "Enter"
@@ -491,13 +491,13 @@ def my_contextmanager():
 
 In [27]:
 
-```
+```py
 with my_contextmanager():
     print 1/0
 
 ```
 
-```
+```py
 Enter
    Error: integer division or modulo by zero
 Exit
@@ -508,7 +508,7 @@ Exit
 
 In [28]:
 
-```
+```py
 @contextmanager
 def transaction(connection):
     cursor = connection.cursor()