目标:创建一个字典,记录几对python词语,使用OrderedDict类来写,并按顺序输出。
写完报错:
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[root@centos7 tmp] # python python_terms.py
File "python_terms.py" , line 9
from name,language in python_terms.items():
^
SyntaxError: invalid syntax
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代码如下:
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from collections import OrderedDict
python_terms = OrderedDict()
python_terms[ 'key' ] = 'vlaue'
python_terms[ 'if' ] = 'match'
python_terms[ 'from' ] = 'import'
from name,language in python_terms.items():
print ( "python have many terms " + name.title() +
language.title() + '.' )
~
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结果for循环的for写成from了……总是出现简单的错误。
最终,正确代码如下:
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from collections import OrderedDict
python_terms = OrderedDict()
python_terms[ 'key' ] = 'vlaue'
python_terms[ 'if' ] = 'match'
python_terms[ 'from' ] = 'import'
for name,language in python_terms.items():
print ( "python have many terms " + name.title() +
" " + language.title() + '.' )
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第一行,从模块collections中导入OrderedDict类;
第二行,创建了OrderedDict类的一个实例,并将其存储到python_terms中,也就是创建了一个空字典;
第三至五行,为字典添加键值对;
最后,循环输出结果。
运行结果:
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[root@centos7 tmp] # python python_terms.py
python have many terms Key Vlaue.
python have many terms If Match.
python have many terms From Import.
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总结
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原文链接:https://blog.csdn.net/zsx0728/article/details/81234532