application_path = 'D:/workspaceweb/workshop-java/src/main/resources/application.yml' application_content: str = '' with open(application_path, "r", encoding="utf-8") as f1: for line in f1: if 'active: pro' in line: line = line.replace('active: pro', 'active: test') application_content += line with open(application_path, "w", encoding="utf-8") as f2: f2.write(application_content)