[英]Value Error when creating dictionary using python 3
我是一名完全不熟悉python的学生,目前正在学习它。 因此,我被要求从包含文件中一行数据的列表中创建字典。
record = ["Name", "ID", "datetime", "Type", "Lat", "Long", "Central Pressure", "Mean radius gf wind", "Max wind speed", "Comment"]
该文件已被导入,并且包含与record
列表中的元素对应的多行数据。
数据示例:
r1 = ["unnamed", "AU190607_01U", "1907-01-17 23:00", "T", "-13", "146.5", "994", "100", "10.3"]
r2 = ["unnamed", "AU190607_01U", "1907-01-17 23:00", "T", "-13", "146.5", "994", "", "10.3"]
所以我的代码就像
def parse_record(record):
key = ["id", "name", "year", "month", "day", "hour", "central pressure",
"radius", "speed", "lat", "long"]
value = [str(record[1]), str(record[0]), int((record[2][:4]),
int((record[2])[5:7]),int((record[2])[8:10]),
int((record[2][10:13]),float(record[6]),
float(record[7]),float(record[8]),float(record[4]), float(record[5])]
record_dictionary = dict(zip(key,value))
return record_dictionary
我期望得到
a1 = {"id": "AU190607_01U", "name": "unnamed", "year": 1907, "month": 1,
"day": 17, "hour": 23,"central pressure": 994.0, "radius": 100.0,
"speed": 10.3, "lat": -13.0, "long": 146.5}
但我收到一条错误消息:
int((record[2])[8:10]),int((record[2])[10:13]), float(record[6]), float(record[7]),
ValueError: could not convert string to float:
并且如果数据中有一个空白值(例如在上面的r2中),则应该将其排除在字典之外,我应该怎么做才能实现这一点?
感谢您的帮助!
错误在于
value = […, float(record[7])…]
由于在第二个值列表中, record[7]
是""
,这不是有效的浮点文字。
尝试实现这个
def parse_record(record):
key = ["id", "name", "year", "month", "day", "hour", "central pressure",
"radius", "speed", "lat", "long"]
record = [i if i else 0 for i in record]
value = [str(record[1]), str(record[0]), int((record[2])[:4]),
int((record[2])[5:7]),int((record[2])[8:10]),
int((record[2])[10:13]),float(record[6]),
float(record[7]),float(record[8]),float(record[4]), float(record[5])]
record_dictionary = dict(zip(key,value))
return record_dictionary
record = ["unnamed", "AU190607_01U", "1907-01-17 23:00", "T", "-13", "146.5", "994", "", "10.3"]
r1 = ["unnamed", "AU190607_01U", "1907-01-17 23:00", "T", "-13", "146.5", "994", "100", "10.3"]
r2 = ["unnamed", "AU190607_01U", "1907-01-17 23:00", "T", "-13", "146.5", "994", "", "10.3"]
parse_record(r1)
parse_record(r2)
请注意,在第二条记录的输出中,您的radius
值将为零。 这是因为该记录没有值。
编辑
我进行了更改。
def parse_record(record):
key = ["id", "name", "year", "month", "day", "hour", "central pressure",
"radius", "speed", "lat", "long"]
record = [i if i else 0 for i in record]
value = [str(record[1]), str(record[0]), int((record[2])[:4]),
int((record[2])[5:7]),int((record[2])[8:10]),
int((record[2])[10:13]),float(record[6]),
float(record[7]),float(record[8]),float(record[4]), float(record[5])]
_ = [(a,b) for a,b in zip(key,value) if b]
record_dictionary = dict(_)
return record_dictionary
record = ["unnamed", "AU190607_01U", "1907-01-17 23:00", "T", "-13", "146.5", "994", "", "10.3"]
r1 = ["unnamed", "AU190607_01U", "1907-01-17 23:00", "T", "-13", "146.5", "994", "100", "10.3"]
r2 = ["unnamed", "AU190607_01U", "1907-01-17 23:00", "T", "-13", "146.5", "994", "", "10.3"]
parse_record(r1)
parse_record(r2)
这是将为您提供空白值(在制作字典时不更改类型)的方法。
record_dictionary = {a:b for a,b in zip(key,value) if b != '' }
上面有一个很好的建议,即@tdube首先压缩zip键和值,然后才更改那里的类型。
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