我正在尝试向(空)字典中添加一个新的键/值对。我有一个包含字符串(年)的文本文件，脚本应该计算年份的出现次数。
with open ("results/results_%s.txt" % bla, "r") as myfile:
for line in myfile:
line = line.translate(None, ''.join(chars_to_remove))
abc = line.split("_", 2)
year = abc[1:2]
year = ''.join(year)
year = year.translate(None, ''.join(chars_to_remove))
raey = {}
#increment the value of the "year"-key, if not present set it to 0 to avoid key erros
raey[year] = raey.get(year, 0) + 1
但是，如果这返回例如 {'2004': 1}，但它应该已经构建了一个字典(如 {1993 : 2, 2012 : 3})，如果我在 for 循环中插入一个“打印”语句我得到例如:
{'1985': 1}
{'2062': 1}
{'1993': 1}
{'2000': 1}
{'2007': 1}
{'2009': 1}
{'1993': 1}
{'1998': 1}
{'1993': 1}
{'1998': 1}
{'2000': 1}
{'2013': 1}
{'1935': 1}
{'1999': 1}
{'1998': 1}
{'1992': 1}
{'1999': 1}
{'1818': 1}
{'2059': 1}
{'1990': 1}
它没有构建正确的字典，代码正在用每个循环替换字典。我做错了什么？
请您参考如下方法:
问题是您在 for 循环中初始化 dict，因此每次都会创建一个新的。相反，将其移出
with open ("results/results_%s.txt" % bla, "r") as myfile:
raey = {}
for line in myfile:
line = line.translate(None, ''.join(chars_to_remove))
abc = line.split("_", 2)
year = abc[1:2]
year = ''.join(year)
year = year.translate(None, ''.join(chars_to_remove))
#increment the value of the "year"-key, if not present set it to 0 to avoid key erros
raey[year] = raey.get(year, 0) + 1
