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1. String Case Conversion

value = "wangdianchao"# Convert to uppercasebig_value = value.upper()print(big_value)# Convert to lowercasesmall_value = big_value.lower()print(small_value)

2. Check if the input string can be converted to a number

num = input("Enter content:")# Check if the input string can be converted to a numberflag = num.isdigit()print(flag)

3. Remove spaces from the string

user = input("Please enter username:")# Remove spaces from the rightnew_user = user.rstrip()print(new_user)user = input("Please enter username:")# Remove spaces from the leftnew_user = user.lstrip()print(new_user)user = input("Please enter username:")# Remove spaces or newlines from both sidesnew_user = user.strip()print(new_user)

4. Replace characters in the string

message = input("Please enter information:")# Replace characters in the string (replace "大爷" with "**")data = message.replace('大爷','**')print(data)message = input("Please enter information:")# Replace only the first occurrence of the characterdata = message.replace('大爷','**',1)print(data)message = input("Please enter information:")# Replace the first two occurrences of the characterdata = message.replace('大爷','**',2)print(data)

5. Split the string

message = "When a ray of morning sunlight shines through the gap in the curtain onto the sleeping face, the slightly opened eyes hazily gaze at everything around, a new day quietly arrives."# Split the string by a specific characterdata = message.split('，')print(data)message = "When a ray of morning sunlight shines through the gap in the curtain onto the sleeping face, the slightly opened eyes hazily gaze at everything around, a new day quietly arrives."# Split the string by a specific character oncedata = message.split('，',1)print(data)message = "When a ray of morning sunlight shines through the gap in the curtain onto the sleeping face, the slightly opened eyes hazily gaze at everything around, a new day quietly arrives."# Split the string from the right oncedata = message.rsplit('，',1)print(data)

6. Check if the string starts with a specified substring

str = "this is string example....wow!!!"# The Python startswith() method checks if the string starts with the specified substring, returning True if it does, otherwise False.print(str.startswith('this'))# 2 is an optional parameter to set the starting position for the string check.# 4 is an optional parameter to set the ending position for the string check.print(str.startswith('is', 2, 4))print(str.startswith('this', 2, 4))

7. Check if the string ends with a specified suffix

str = "this is string example....wow!!!"suffix = "wow!!!"# Check if the string ends with the specified suffix, returning True if it does, otherwise False.print(str.endswith(suffix))print(str.endswith(suffix, 20))suffix = "is"# 2 indicates the starting position in the string# 4 indicates the ending position in the stringprint(str.endswith(suffix,2,4))print(str.endswith(suffix,2,6))

8. String Formatting

str = "Website name: {name}, Address {url}"# Format the characters in the above string{} to the desired charactersprint(str.format(name="Baidu", url="www.baidu.com"))

9. Change the string encoding format

str = "this is string example....wow!!!"# Change the string encoding formatprint(str.encode('utf-8'))

10. Join elements of a sequence into a new string with a specified character

str = "-"seq = ("a", "b", "c") # Elements in the string sequence must be strings# Join the elements in the seq sequence with the str string to generate a new string.print(str.join(seq))

11. Convert between strings and binary

data = '王佃超'# Convert the string to binarynew_data = data.encode('utf-8')# Convert the binary encoding back to stringyhf = new_data.decode('utf-8')print(yhf)

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