File[] files = file.listFiles();
时间: 2024-05-19 19:12:20 浏览: 9
这行代码是用于获取指定目录下的所有文件和子目录的文件数组。其中,file是一个File对象,表示要遍历的目录。listFiles()方法返回的是一个File数组,包含了该目录下的所有文件和子目录。可以使用for循环遍历这个数组,来访问这些文件和目录。需要注意的是,如果指定的目录不存在或者不是一个目录,listFiles()方法将会返回null。因此,在使用这个方法之前,需要先判断指定的目录是否存在,并且是否是一个目录。
相关问题
>>> import sys ... ... reload(sys) ... ... sys.setdefaultencoding('utf-8') ... ... import arcpy ... ... import string ... ... try: ... ... workspace = 'C:\Users\Administrator\Desktop\\qwe' ... ... outdb = 'C:\Users\Administrator\Desktop\\lutian.mdb' ... ... arcpy.env.workspace = workspace ... ... files = arcpy.ListFiles('*.*db') ... ... arcpy.env.workspace = outdb ... ... fcs = arcpy.ListFeatureClasses() ... ... fcs = fcs + arcpy.ListTables() ... ... dss = arcpy.ListDatasets() ... ... for File in files: ... ... for fc in fcs: ... ... arcpy.Append_management(workspace + '\\' + File + '\\' + fc, outdb + '\\' + fc) ... ... for ds in dss: ... ... fcs1 = arcpy.ListFeatureClasses(feature_dataset = ds) ... ... for fc1 in fcs1: ... ... arcpy.Append_management(workspace + '\\' + File + '\\' + ds + '\\' + fc1, outdb + '\\' + ds + '\\' + fc1) ... ... except arcpy.ExecuteError: ... ... print arcpy.GetMessages() ... Parsing error IndentationError: expected an indented block (line 13),展示修改后的代码
这里是修改后的代码,你可以尝试运行看看。
```python
import sys
import arcpy
import string
reload(sys)
sys.setdefaultencoding('utf-8')
try:
workspace = 'C:\Users\Administrator\Desktop\\qwe'
outdb = 'C:\Users\Administrator\Desktop\\lutian.mdb'
arcpy.env.workspace = workspace
files = arcpy.ListFiles('*.*db')
arcpy.env.workspace = outdb
fcs = arcpy.ListFeatureClasses()
fcs = fcs + arcpy.ListTables()
dss = arcpy.ListDatasets()
for File in files:
for fc in fcs:
arcpy.Append_management(workspace + '\\' + File + '\\' + fc, outdb + '\\' + fc)
for ds in dss:
fcs1 = arcpy.ListFeatureClasses(feature_dataset = ds)
for fc1 in fcs1:
arcpy.Append_management(workspace + '\\' + File + '\\' + ds + '\\' + fc1, outdb + '\\' + ds + '\\' + fc1)
except arcpy.ExecuteError:
print arcpy.GetMessages()
```
修改后的代码中,缩进问题已经被修复,每个代码块都正确缩进。另外,由于你使用了Python 2.x版本,所以在代码中加入了`reload(sys)`和`sys.setdefaultencoding('utf-8')`,以确保正确处理中文字符集。
>>> import sys ... import arcpy ... import string ... ... reload(sys) ... sys.setdefaultencoding('utf-8') ... ... try: ... workspace = 'C:\Users\Administrator\Desktop\\qwe' ... outdb = 'C:\Users\Administrator\Desktop\\lutian.mdb' ... arcpy.env.workspace = workspace ... files = arcpy.ListFiles('*.*db') ... arcpy.env.workspace = outdb ... fcs = arcpy.ListFeatureClasses() ... fcs = fcs + arcpy.ListTables() ... dss = arcpy.ListDatasets() ... ... for File in files: ... for fc in fcs: ... arcpy.Append_management(workspace + '\\' + File + '\\' + fc, outdb + '\\' + fc) ... ... for ds in dss: ... fcs1 = arcpy.ListFeatureClasses(feature_dataset = ds) ... for fc1 in fcs1: ... arcpy.Append_management(workspace + '\\' + File + '\\' + ds + '\\' + fc1, outdb + '\\' + ds + '\\' + fc1) ... ... except arcpy.ExecuteError: ... print arcpy.GetMessages() ... Runtime error Traceback (most recent call last): File "<string>", line 15, in <module> TypeError: unsupported operand type(s) for +: 'NoneType' and 'NoneType',根据错误完善此代码
这段代码中出现了两个问题,一个是缩进问题,一个是字符串连接问题。以下是修改后的代码。
```python
import sys
import arcpy
import string
reload(sys)
sys.setdefaultencoding('utf-8')
try:
workspace = 'C:\\Users\\Administrator\\Desktop\\qwe'
outdb = 'C:\\Users\\Administrator\\Desktop\\lutian.mdb'
arcpy.env.workspace = workspace
files = arcpy.ListFiles('*.*db')
arcpy.env.workspace = outdb
fcs = arcpy.ListFeatureClasses()
fcs = fcs + arcpy.ListTables()
dss = arcpy.ListDatasets()
for File in files:
for fc in fcs:
arcpy.Append_management(workspace + '\\' + File + '\\' + fc, outdb + '\\' + fc)
for ds in dss:
fcs1 = arcpy.ListFeatureClasses(feature_dataset = ds)
for fc1 in fcs1:
arcpy.Append_management(workspace + '\\' + File + '\\' + ds + '\\' + fc1, outdb + '\\' + ds + '\\' + fc1)
except arcpy.ExecuteError:
print(arcpy.GetMessages())
```
修改后的代码中,缩进问题已经被修复,并且修改了字符串连接方式,使用双反斜杠来转义路径中的反斜杠,防止出现字符串连接问题。另外,在except语句中,使用了print函数来输出错误信息。
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