```python
import os
```
## Basic Operations
- os.getcwd()
- os.listdir()
- os.makedirs()
```python
print("Current Directory: ", os.getcwd())
print(type(os.getcwd()))
```
Current Directory: C:\Users\Brian\Python\Learning Notes\Practices\OS
<class 'str'>
```python
print("List all things in Current Diectory: ", os.listdir())
print(type(os.listdir()))
```
List all things in Current Diectory: ['.ipynb_checkpoints', 'os_files.ipynb', 'Untitled.ipynb']
<class 'list'>
```python
# can only execute once. Will throw FileExistsError if execute over once.
os.makedirs("project")
```
```python
# pass in the argument to ignore the FileExistsError
os.makedirs("project", exist_ok=True)
```
```python
print(os.path.exists("project"))
```
True
## os.path
```python
# create a demo text file first
os.makedirs("project", exist_ok=True)
with open("project/test.txt", "w") as f:
f.write("testing")
```
```python
print(os.path.isfile("project/test.txt")) # True
```
True
```python
print(os.path.exists("project/test.txt")) # True
```
True
```python
print(os.path.isdir("project/test.txt")) # False
```
False
```python
os.makedirs("project/test", exist_ok=True)
print(os.path.isdir("project/test")) # True
```
True
## Other useful methods
```python
# get the file name without the path
os.path.basename("project/test.txt")
```
'test.txt'
```python
# get the name of the directory
os.path.dirname("project/test.txt")
```
'project'
```python
# or just split the path name into two different variables
dir_name, filename = os.path.split("project/test.txt")
print(dir_name)
print(filename)
```
project
test.txt
```python
path = os.path.join(dir_name, filename)
print(path)
```
project\test.txt
## Implement a file copy function
```python
import os
import shutil
def copy(path):
# get directory name and base filename
dir_name, filename = os.path.split(path)
# create a new filename
new_name = "copied_" + filename
# concatenate a new filename with path
new_path = os.path.join(dir_name, new_name)
# copy file
shutil.copy2(path, new_path)
return os.path.isfile(new_path), new_path
```
```python
# test functionality
is_copied, filepath = copy("project/test.txt")
if is_copied:
print(f"Successfully Copied to path: {filepath}")
else:
print("Copy Failed")
```
```
Successfully Copied to path: project\copied_test.txt
```
```python
# copy using file i/o
def copy_file(path):
dir_name, filename = os.path.split(path)
new_name = "new_" + filename
new_path = os.path.join(dir_name, new_name)
with open(path, "r") as f:
content = f.readlines()
with open(new_path, "w") as f:
f.writelines(content)
return os.path.isfile(new_path), new_path
is_copied, filepath = copy_file("project/test.txt")
if is_copied:
print(f"Successfully Copied to path: {filepath}")
else:
print("Copy Failed")
```
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