A file path identifies a file or directory. In Python, pathlib’s Path class provides path operations; combining a directory and filename with `/` creates a path that works across operating systems. section 11.4.1 section 11.6
Use Path objects to manage files and inspect their names:
- Create directories with mkdir and check paths with exists. section 11.4.1
- Find matching files with glob; create target paths and move files with rename, or remove files with unlink. section 11.4.3 section 11.4.5
- Read path details through parent, name, stem, and suffix. section 11.5.1
Listing 11.18 Retrieving filename information
from pathlib import Path
subjects_folder = Path("subjects")
for dat_path in subjects_folder.glob("**/*.dat"): #1
subject_dir = dat_path.parent #2
filename = dat_path.stem #3
config_path = subject_dir / f"{filename}.config"
print(f"{subject_dir} & {filename} -> {config_path}")
dat_exists = dat_path.exists()
config_exists = config_path.exists()
with open(dat_path) as dat_file, open(config_path) as config_file: #4
print(f"Process {filename}: dat? {dat_exists}, config?
{config_exists}\n")
# process the subject's data
# output the following lines:
subjects/subject_125 & subject_125 -> subjects/subject_125/subject_125.config
Process subject_125: dat? True, config? True
subjects/subject_124 & subject_124 -> subjects/subject_124/subject_124.config
Process subject_124: dat? True, config? True
subjects/subject_123 & subject_123 -> subjects/subject_123/subject_123.config
Process subject_123: dat? True, config? True
Follow a pattern that finds .dat files in subject folders, retrieves each file’s directory and stem, and constructs the matching .config path. section 11.5.1
