[英]How to add a field to a dbf file?
我有這樣的事情:
from dbfpy import dbf
import random
db = dbf.Dbf('DMWWGS84/DMAWGS84.dbf',new=False)
db.addField(("Data","D"))
for record in db:
print record
record["Data"]=random.random()
db.close()
但它抱怨:
Traceback (most recent call last):
File "merge_csv.py", line 5, in <module>
db.addField(("Data","D"))
File "/Users/alex/anaconda2/lib/python2.7/site-packages/dbfpy/dbf.py", line 246, in addField
raise TypeError("At least one record was added, "
TypeError: At least one record was added, structure can't be changed
它在談論什么記錄? 這是這樣做的好方法嗎?
改用我的dbf庫:
pip安裝dbf
(您可能需要先pip install enum34
)
然后命令:
# lightly tested
import dbf
import random
db = dbf.Table('whatever.dbf')
with db:
db.add_fields('data N(12,7)')
for record in db:
dbf.write(record, data=random.random())
注意 :將隨機數寫入日期字段將無法正常工作。
該答案中有一個錯誤,您應該在使用文件之前打開該文件:
import dbf
import random
db = dbf.Table('whatever.dbf')
db.open()
with db:
db.add_fields('data N(12,7)')
for record in db:
dbf.write(record, data=random.random())
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