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# Example: Opening an existing ISO
This example will show how to examine an existing ISO. Here's the complete code for this example:
```
import sys
import pycdlib
iso = pycdlib.PyCdlib()
iso.open(sys.argv[1])
for child in iso.list_children(iso_path='/'):
print(child.file_identifier())
iso.close()
```
Let's take a closer look at the code.
```
import sys
import pycdlib
```
As we've seen before, import pycdlib. We also import the sys module so we get access to the command-line arguments.
```
iso = pycdlib.PyCdlib()
iso.open(sys.argv[1])
```
As we saw in the last example, create a new PyCdlib object. Once we have the object, we can then open up the file passed on the command-line. During the open, PyCdlib will parse all of the metadata on the ISO, so if the file is coming over a network, this may take a bit of time. Note that besides the [open](pycdlib-api.html#PyCdlib-open) method, there is also an [open_fp](pycdlib-api.html#PyCdlib-open_fp) method that takes an arbitrary file-like object.
```
for child in iso.list_children(iso_path='/'):
print(child.file_identifier())
```
Use the [list_children](pycdlib-api.html#PyCdlib-list_children) API from PyCdlib to iterate over all of the files and directories at the root of the ISO. As discussed in the [Creating a new, basic ISO](example-creating-new-basic-iso.md) example, the paths are Unix-like absolute paths.
```
iso.close()
```
Close out the PyCdlib object, releasing all resources and invalidating the contents. After this call, the object can be reused to create a new ISO or open up an existing ISO.
---
<div style="width: 100%; display: table;">
<div style="display: table-row;">
<div style="width: 33%; display: table-cell; text-align: left;">
<a href="example-creating-new-basic-iso.html"><-- Example: Creating a new, basic ISO</a>
</div>
<div style="width: 33%; display: table-cell; text-align: center;">
<a href="https://clalancette.github.io/pycdlib/">Top</a>
</div>
<div style="width: 33%; display: table-cell; text-align: right;">
<a href="example-extracting-data-from-iso.html">Example: Extracting data from an existing ISO --></a>
</div>
</div>
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