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# Checking if a user's bio mentions specific skills
user_bio = "Experienced in Python programming and data analysis."

print("Python" in user_bio)      # True → the bio mentions Python
print("Java" not in user_bio)    # True → Java is not listed as a skill

              
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# Searching for keywords inside a product description
description = "This brand new bracelet is made from recycled materials."

print(description.find("bra"))     # 5  → first occurrence of "bra"
print(description.rfind("bra"))    # 5  → only one "bra" found
print(description.find("gold"))    # -1 → not found, returns -1
print(description.index("bra"))    # 5  → same as find(), but raises an error if not found
print(description.index("gold"))   # ValueError → "gold" not in the text

              
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# Counting occurrences of words or letters in a customer review
review = "Amazing banana smoothie with banana slices on top!"

print(review.count("banana"))  # 2 → the word appears twice
print(review.count("a"))       # 8 → letter 'a' appears multiple times

              
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# Checking if the uploaded file has the correct name and format
uploaded_file = "report_final.pdf"

print(uploaded_file.startswith("report"))  # True → file name starts correctly
print(uploaded_file.endswith(".pdf"))      # True → valid file format for upload

              
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# Checking a user's message for a polite greeting
user_message = "Hello, team! Let's start the meeting."

print("hello" in user_message.lower())          # True → greeting detected
print(user_message.lower().startswith("hello")) # True → message begins with "hello"