deff1(delta_seconds):ifdelta_seconds<11*24*3600:returnimportdis dis.dis(f1)# dis 执行结果50LOAD_FAST0(delta_seconds)2LOAD_CONST1(950400)4COMPARE_OP0(<)6POP_JUMP_IF_FALSE1268LOAD_CONST0(None)10RETURN_VALUE>>12LOAD_CONST0(None)14RETURN_VALUE 看见上面的2 LOAD_CONST 1 (950400)了吗?这...
6. String Concatenation In python, we concatenate strings using the ‘+’ operator. But another way to concatenate the strings in python is using thejoinmethod. Join method is a more pythonic way to concatenate strings, and it is also faster than concatenating strings with the ‘+’ operator....
So, f-strings are readable, concise, and also fast.Upgrading F-Strings: Python 3.12 and BeyondNow that you’ve learned why f-strings are great, you’re probably eager to get out there and start using them in your code. However, you need to know that f-strings up to Python 3.11 have...
0 LOAD_FAST 0 (value) 2 LOAD_CONST 1 (1) 4 INPLACE_ADD 6 STORE_FAST 0 (value) 8 LOAD_CONST 0 (None) 10 RETURN_VALUE 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 在上面输出结果中,可以看到这个简单的累加语句,会被编译成包括取值和保存在内的好几个不同步骤,而在多...
Note: In modern Python, you’ll often see f-strings used and find yourself using them for string interpolation. This is because f-strings are readable, clean, and fast. However, there are better solutions for some use cases. Sometimes, you need to perform lazy interpolation, in which case...
Concatenation seq1 + seq2 concat(seq1, seq2) Containment Test obj in seq contains(seq, obj) Division a / b div(a, b) (without future.division) Division a / b truediv(a, b) (with future.division) Division a // b floordiv(a, b) Bitwise And a & b and_(a, b) Bitwise Exclusi...
Finally, you can do all the string handling yourself by using string slicing and concatenation operations to create any layout you can imagine. The string type has some methods that perform useful operations for padding strings to a given column width....
dis.dis(f1)# dis 执行结果50LOAD_FAST0(delta_seconds)2LOAD_CONST1(950400)4COMPARE_OP0(<)6POP_JUMP_IF_FALSE1268LOAD_CONST0(None)10RETURN_VALUE >>12LOAD_CONST0(None)14RETURN_VALUE 看见上面的 2 LOAD_CONST 1 (950400) 了吗?这表示 Python 解释器在将源码编译成成字节码时,会计算 11 * 24 ...
deque provides double-ended queues with fast append and removal at both ends of the collection. ChainMap lets you fold multiple mapping objects into a single view on the mapping. Counter provides a mapping for counting hashable objects. defaultdict provides a mapping that calls a factory function ...
def incr(value): value += 1 # 使用 dis 模块查看字节码 import dis dis.dis(incr) 0 LOAD_FAST 0 (value) 2 LOAD_CONST 1 (1) 4 INPLACE_ADD 6 STORE_FAST 0 (value) 8 LOAD_CONST 0 (None) 10 RETURN_VALUE 在上面输出结果中,可以看到这个简单的累加语句,会被编译成包括取值和保存在内的好...