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Commit 8cc52d1

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添加格式化打印错误集合板块
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‎chapter_1/print_2.py‎

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@@ -13,6 +13,13 @@
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strHello = "the length of (%s) is %d" %('Hello Watermelon',len('Hello Watermelon'))
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print(strHello) # the length of (Hello Watermelon) is 16
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strHello = "Hello Watermelon"
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print(strHello) # Hello Watermelon
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print ("%.*s" % (4,strHello)) # Hell
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print ("%.3s " % (strHello)) # Hel
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# print ("%.*S" % (4,strHello)) # ValueError: unsupported format character 'S' (0x53)
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# print ("%.3S " % (strHello)) # ValueError: unsupported format character 'S' (0x53)
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print ("%s" % ("Hello Watermelon")) # Hello Watermelon
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print('\n')
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print('\n')
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@@ -444,4 +451,104 @@
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print('\n')
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#------------------------------------------------------------------------------------------------格式化打印数字Number end
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#------------------------------------------------------------------------------------------------格式化打印错误集合 start
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print('格式化打印错误集合 start ------------------------------------------------------------------------------------------------')
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print("逗号错误 --------------------------------")
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# 请注意`左参数`和`右参数`之间不存在逗号,如果写了逗号,会报错。
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# print("%s,%s", % ("hello","watermelon"))
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# SyntaxError: invalid syntax
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print("进制转换错误 --------------------------------")
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print("\t\t\t\t数据类型必须是小写字母")
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# `八进制类型`,`十进制类型`和`字符串类型`的缩写必须是`小写字母`,换成`大写字母`会报错。
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# print ("%O " % ("Hello Watermelon"))
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'''
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Traceback (most recent call last):
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File "<pyshell#15>", line 1, in <module>
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print ("%O " % ("Hello Watermelon"))
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ValueError: unsupported format character 'O' (0x4f) at index 1
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'''
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# print ("%D " % ("Hello Watermelon"))
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'''
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Traceback (most recent call last):
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File "<pyshell#13>", line 1, in <module>
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print ("%D " % ("Hello Watermelon"))
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ValueError: unsupported format character 'D' (0x44) at index 1
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'''
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# print ("%S " % ("Hello Watermelon"))
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'''
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Traceback (most recent call last):
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File "<pyshell#14>", line 1, in <module>
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print ("%S " % ("Hello Watermelon"))
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ValueError: unsupported format character 'S' (0x53) at index 1
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'''
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print("\t\t\t\t数据类型必须是数字类型")
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# 做`类型转换`的时候,`浮点类型`和`十进制类型`需要传入的参数必要是`数字类型`的。
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# print ("%d " % ("Hello Watermelon"))
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'''
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Traceback (most recent call last):
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File "<pyshell#18>", line 1, in <module>
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print ("%d " % ("Hello Watermelon"))
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TypeError: %d format: a number is required, not str
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'''
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# print ("%F " % ("Hello Watermelon"))
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'''
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Traceback (most recent call last):
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File "<pyshell#19>", line 1, in <module>
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print ("%F " % ("Hello Watermelon"))
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TypeError: must be real number, not str
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'''
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print("\t\t\t\t数据类型必须是整型")
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# 做`类型转换`的时候,`十六进制类型`和`八进制类型`需要传入的参数必要是`整型`。
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# print ("%X " % ("Hello Watermelon"))
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'''
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Traceback (most recent call last):
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File "<pyshell#11>", line 1, in <module>
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print ("%X " % ("Hello Watermelon"))
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TypeError: %X format: an integer is required, not str
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'''
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# print ("%o " % ("Hello Watermelon"))
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'''
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Traceback (most recent call last):
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File "<pyshell#16>", line 1, in <module>
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print ("%o " % ("Hello Watermelon"))
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TypeError: %o format: an integer is required, not str
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'''
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print("参数个数错误 --------------------------------")
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# `左参数`的`个数`和`右参数`的`个数`一定要相等。
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# print ("%s,%s" % ("Hello","Watermelon","!"))
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'''
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Traceback (most recent call last):
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File "<pyshell#29>", line 1, in <module>
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print ("%s,%s" % ("Hello","Watermelon","!"))
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TypeError: not all arguments converted during string formatting
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'''
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#------------------------------------------------------------------------------------------------格式化打印错误集合 end
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