- Python : 3.7.3
- OS : Ubuntu 18.04.2 LTS
- IDE : pycharm-community-2019.1.3
- Conda : 4.7.5
- typesetting : Markdown
code
"""
@Author : 行初心
@Date : 2019/7/6
@Blog : www.cnblogs.com/xingchuxin
@Gitee : gitee.com/zhichengjiu
"""
def yield_test():
a = 1
# next() 遇到yield会停止，保存数据并返回后面的数值
yield a
a += 1
yield a
a += 1
yield a
a += 1
yield a
# 需要这个返回值，可是....next()遇到yield就停了呀。再next抛异常，如何办？
# 用StopIteration
return "work done"
def main():
test = yield_test()
# 很标准的模板
while True:
try:
x = test.__next__()
print(x)
except StopIteration as e:
# e.value 就是 return 返回的值
print("return value is", e.value)
break
if __name__ == '__main__':
main()
result
/home/coder/anaconda3/envs/py37/bin/python /home/coder/PycharmProjects/NumericalComputation/demo.py
1
2
3
4
return value is work done
Process finished with exit code 0
source_code
class StopIteration(Exception):
""" Signal the end from iterator.__next__(). """
def __init__(self, *args, **kwargs): # real signature unknown
pass
value = property(lambda self: object(), lambda self, v: None, lambda self: None) # default
"""generator return value"""
resource
- [文档 - English] docs.python.org/3
- [文档 - 中文] docs.python.org/zh-cn/3
- [规范] www.python.org/dev/peps/pep-0008
- [规范] zh-google-styleguide.readthedocs.io/en/latest/google-python-styleguide/python_language_rules
- [源码] www.python.org/downloads/source
- [ PEP ] www.python.org/dev/peps
- [平台] www.cnblogs.com
- [平台] gitee.com
Python具有开源、跨平台、解释型、交互式等特性，值得学习。
Python的设计哲学：优雅，明确，简单。提倡用一种方法，最好是只有一种方法来做一件事。
代码的书写要遵守规范，这样有助于沟通和理解。
每种语言都有独特的思想，初学者需要转变思维、踏实践行、坚持积累。