Python Strings
Strings in Python are immutable sequences of Unicode characters. You can write them with single, double, or triple quotes — pick whichever needs the least escaping.
Quotes
PYTHON
'single' "double" '''triple — can span multiple lines''' """triple double — also multi-line"""
Indexing & slicing
PYTHON
s = 'Hello, Python!' print(s[0]) # 'H' print(s[-1]) # '!' print(s[0:5]) # 'Hello' print(s[7:]) # 'Python!' print(s[::-1]) # reversed
Common methods
| Method | Returns |
|---|---|
len(s) | Character count. |
s.upper() / s.lower() / s.title() | Case. |
s.strip() | Trim whitespace. |
s.replace(a, b) | Replace substring. |
s.split(',') | Split on delimiter. |
','.join(seq) | Join an iterable. |
s.startswith(p) / s.endswith(p) | Prefix / suffix test. |
s.find(t) | Index of t, or -1. |
f-strings
PYTHON
name = 'Ada'
age = 36
print(f'{name} is {age}') # Ada is 36
print(f'{name!r} → {age:03d}') # 'Ada' → 036
print(f'{3.14159:.2f}') # 3.14
Tip: Strings are immutable.
s.upper() returns a new string — it doesn't change s.Example
Example
s = 'Hello, Python!'
print(len(s))
print(s.upper())
print(s.replace('Python', 'world'))
print(s[0:5])
print(f'shouted: {s.upper()!r}')
Try it Yourself »
Exercise
Use an f-string to interpolate the variable name.
'Hello, {name}!'
A single letter prefix.
Discussion
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