This content originally appeared on DEV Community and was authored by Super Kai (Kazuya Ito)
*Memo:
- My post explains a string (1).
- My post explains a string (2).
- My post explains a string (4).
- My post explains str() (1).
- My post explains str() (2).
A string can be enlarged with * and a number as shown below:
v = 'ABCDE' * 3
print(v)
# ABCDEABCDEABCDE
v = '01234' * 3
print(v)
# 012340123401234
v = '' * 3
print(v)
# Nothing
A string and other strings can be concatenated with + as shown below:
v = 'ABC' + 'DE' + 'FGHI'
print(v)
# ABCDEFGHI
A string and other strings cannot return:
- all the characters in them with
'|'(Union: A ∪ B). - their common characters with
'&'(Intersection: A ∩ B). - the characters in the string which aren't in other string with
'-'(Difference: A - B).
print('AE' | 'ACE' | 'ABDE')
# TypeError: unsupported operand type(s) for |: 'str' and 'str'
print('AE' & 'ACE' & 'ABDE')
# TypeError: unsupported operand type(s) for &: 'str' and 'str'
print('AE' - 'ACE' - 'ABDE')
# TypeError: unsupported operand type(s) for -: 'str' and 'str'
A string and other string cannot return the characters in the string but not in other string or not in the string but in other string with '^' (Symmetric Difference: A Δ B) as shown below:
print('ABCD' ^ 'ACE')
# TypeError: unsupported operand type(s) for ^: 'str' and 'str'
A string can be iterated with a for statement as shown below:
for v in 'ABC':
print(v)
# A
# B
# C
A string can be unpacked with an assignment and for statement, the function and * but not with ** as shown below:
v1, v2, v3 = 'ABC'
print(v1, v2, v3)
# A B C
v1, *v2, v3 = 'ABCDEF'
print(v1, v2, v3) # A ['B', 'C', 'D', 'E'] F
print(v1, *v2, v3) # A B C D E F
print(*v1, *v2, *v3) # A B C D E F
for v1, v2, v3 in ['ABC', 'DEF']:
print(v1, v2, v3)
# A B C
# D E F
for v1, *v2, v3 in ['ABCDEF', 'GHIJKL']:
print(v1, v2, v3)
print(v1, *v2, v3)
print(*v1, *v2, *v3)
# A ['B', 'C', 'D', 'E'] F
# A B C D E F
# A B C D E F
# G ['H', 'I', 'J', 'K'] L
# G H I J K L
# G H I J K L
print(*'ABCD', *'EF')
# A B C D E F
print([*'ABCD', *'EF'])
# ['A', 'B', 'C', 'D', 'E', 'F']
def func(p1='a', p2='b', p3='c', p4='d', p5='e', p6='f'):
print(p1, p2, p3, p4, p5, p6)
func()
# a b c d e f
func(*'ABCD', *'EF')
# A B C D E F
def func(p1='a', p2='b', *args):
print(p1, p2, args)
print(p1, p2, *args)
print(p1, p2, [0, 1, *args, 2, 3])
func()
# a b ()
# a b Nothing
# a b [0, 1, 2, 3]
func(*'ABCD', *'EF')
# A B ('C', 'D', 'E', 'F')
# A B C D E F
# A B [0, 1, 'C', 'D', 'E', 'F', 2, 3]
Be careful, a big string gets OverflowError as shown below:
v = 'ABCDE' * 1000000000
print(v)
# OverflowError: repeated string is too long
This content originally appeared on DEV Community and was authored by Super Kai (Kazuya Ito)
Super Kai (Kazuya Ito) | Sciencx (2025-10-27T02:32:19+00:00) String in Python (3). Retrieved from https://www.scien.cx/2025/10/27/string-in-python-3/
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