nc文件变量属性写入

TSY11235

代码如下
import netCDF4 as ncimport numpy as np



file_obj = nc.Dataset(r'F:\\Data\\ERA5\\pressure-levels\\20180621\\pressure-levels-2018062101.nc')
all_vars = file_obj.variables.keys() #获取全部变量名称
all_vars = list(all_vars)

all_vars_info = file_obj.variables.items()
all_vars_info = list(all_vars_info)

lat = file_obj.variables['latitude'][:]
lon = file_obj.variables['longitude'][:]
level = file_obj.variables['level'][:]
time = file_obj.variables['time'][:]
cc0 = file_obj.variables['cc'][:]
data = np.array(cc0)


file_path = pathlib.Path(r'F:\\Data\\ERA5\\pressure-levels\\Fraction of cloud cover\\cc_2018062101.nc')
if file_path.is_file:
    file_path.unlink()
else:
    print(f"Error:{file_path} file not found")

f_w = nc.Dataset(file_path, 'w', format = 'NETCDF4')

f_w.createDimension('time',1)  
f_w.createDimension('level',29)
f_w.createDimension('lat',721)   
f_w.createDimension('lon',1440)


f_w.createVariable('time',np.int32,('time'))  
f_w.createVariable('level',np.int32,('level'))  
f_w.createVariable('latitude',np.float32,('lat'))  
f_w.createVariable('longitude',np.float32,('lon'))


f_w.variables['time'][:] = time[:]
f_w.variables['level'][:] = level[:]
f_w.variables['latitude'][:] = lat[:]
f_w.variables['longitude'][:] = lon[:]


f_w.createVariable('cc', np.float64, ('time','level','lat','lon'))
f_w.variables['cc'][:] = data
print('data have been written')


f_w.close()
file_obj.close()

#这部分代码可将cc变量写入，但如图所示，没有属性信息
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在查阅过程中发现setattr函数可以创建变量的局部信息，变量赋值后想要写入属性信息，代码如下
for i in range(len(all_vars)):
    setattr(all_vars[i],'variables',all_vars_info[i])


报错信息如下：
setattr(all_vars[i],'variables',all_vars_info[i])

AttributeError: 'str' object has no attribute 'variables'

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这两天刚接触NC文件，恳请各位不吝赐教！