Rename glob/README.md to python_basics/glob/README.md

Signed-off-by: David Rotermund <54365609+davrot@users.noreply.github.com>

python_basics/glob/README.md

@@ -0,0 +1,119 @@
+# [glob](https://docs.python.org/3/library/glob.html) : Finding files in a directory
+{:.no_toc}
+
+<nav markdown="1" class="toc-class">
+* TOC
+{:toc}
+</nav>
+
+## Goal
+We want to deal with many files in a directory. What is an easy way to get the filename in a directory?
+
+Questions to [David Rotermund](mailto:davrot@uni-bremen.de)
+
+## Creating test files
+
+```python
+from pathlib import Path
+
+Path("Testfile_1.mat").touch()
+Path("Testfile_2.mat").touch()
+Path("Testfile_10.mat").touch()
+Path("Testfile_3.mat").touch()
+```
+
+## Using glob in a for-loop
+
+```python
+import glob
+
+for filename in glob.glob("*.mat"):
+    print(filename)
+```
+
+```python
+Testfile_1.mat
+Testfile_2.mat
+Testfile_10.mat
+Testfile_3.mat
+```
+
+## Using glob to create a list
+
+```python
+import glob
+
+list = glob.glob("*.mat")
+print(list)
+```
+
+```python
+['Testfile_1.mat', 'Testfile_2.mat', 'Testfile_10.mat', 'Testfile_3.mat']
+```
+
+### Sorting the filenames
+
+```python
+import glob
+
+list = sorted(glob.glob("*.mat"))
+print(list)
+```
+
+```python
+['Testfile_1.mat', 'Testfile_10.mat', 'Testfile_2.mat', 'Testfile_3.mat']
+```
+Hmmm... This result is not helpful.
+
+### Sorting the filenames with [natsort](https://pypi.org/project/natsort/)
+
+```shell
+pip install natsort
+```
+
+```python
+import glob
+from natsort import natsorted
+
+list = natsorted(glob.glob("*.mat"))
+print(list)
+```
+
+```python
+['Testfile_1.mat', 'Testfile_2.mat', 'Testfile_3.mat', 'Testfile_10.mat']
+```
+
+## rsplit 
+
+And maybe you don't want to have the file extensions. Then we can use [rsplit](https://docs.python.org/3/library/stdtypes.html#str.rsplit) on the string.
+
+```python
+import glob
+from natsort import natsorted
+
+for filename in natsorted(glob.glob("*.mat")):
+    print(filename.rsplit(".", 1)[0])
+```
+
+```python
+Testfile_1
+Testfile_2
+Testfile_3
+Testfile_10
+```
+
+Alternatively without a for-loop but using [map](https://docs.python.org/3/library/functions.html#map) ,  [list](https://docs.python.org/3/library/functions.html#func-list) and [lambda functions](https://docs.python.org/3/reference/expressions.html#lambda):
+
+```python
+import glob
+from natsort import natsorted
+
+filenames = natsorted(glob.glob("*.mat"))
+filenames = list(map(lambda s: s.rsplit(".", 1)[0], filenames))
+print(filenames)
+```
+
+```python
+['Testfile_1', 'Testfile_2', 'Testfile_3', 'Testfile_10']
+```
+