(a, b, a - b))print('{} * {} = {}'.format(a, b, a * b))print('{} / {} = {:.2f}'.format(a, b, a / b)) # limits it to two digits after decimalprint('{} % {} = {}'.format(a, b, a % b))print('{} // {} = {}'.format(a, b, a // b))print(...
What if you want to print the last character of a string but you don’t know how long it is?You can do that usingnegative indexes. In the example above, we don’t know the length of the string, but we know that the word ‘text’ plus the exclamation sign take five indices, so w...
decimal 模块为快速正确舍入的十进制浮点运算提供支持。 它提供了 float 数据类型以外的几个优点: Decimal 类型的“设计是基于考虑人类习惯的浮点数模型,并且因此具有以下最高指导原则—— 计算机必须提供与人们在学校所学习的算术相一致的算术。”—— 摘自 decimal 算术规范描述。 Decimal 数字的表示是精确的。 相比...
When you write large numbers by hand, you typically group digits into groups of three separated by a comma or a decimal point. The number 1,000,000 is a lot easier to read than 1000000.In Python, you can’t use commas to group digits in integer literals, but you can use underscores ...
#!/usr/bin/python str = "http:///" print str.partition("://") 输出结果为: ('http', '://', '/') 1. 2. 3. 4. 5. 6. 7. def replace(self, old, new, count=None): # real signature unknown; restored from __doc__ (把字符串中的old(旧字符串)替换成new(新字符串),如果指...
While pathological cases do exist, for most casual use of floating-point arithmetic you’ll see the result you expect in the end if you simply round the display of your final results to the number of decimal digits you expect.str()usually suffices, and for finer control see thestr.format...
.isdecimal() True if all characters in the string are decimals, False otherwise .isdigit() True if all characters in the string are digits, False otherwise .isidentifier() True if the string is a valid Python name, False otherwise .islower() True if all characters in the string are lower...
print(divmod(10, 3))#(3, 1)print(divmod(19.1, 3))#(6.0, 1.1000000000000014) 5. round(number[, ndigits]) 描述:四舍五入。这个函数与数学上的四舍五入概念是不一样的。 如果要求和数学的四舍五八一致,还是要引入import decimal模块。
# # Display tax amount with two digits after decimal point # print("Sales tax is",int(tax * 100) / 100.0) # 程序清单2-7 # import time # current_time = time.time() # 得到当前的秒数,小数点后的位数表示精确度 # # # Obtain the total seconds since midnight,Jan 1,1970 ...
We can show one digit after the decimal point with.1f: >>>print(f"One digit:{n:.1f}and{pi:.1f}")One digit: 4.0 and 3.1 Two digits with.2f: >>>print(f"Two digits:{n:.2f}and{pi:.2f}")Two digits: 4.00 and 3.14 Or zero digits with.0f: ...