A great use case for unpacking is when you need to swap the values between two variables:Python >>> a = 5 >>> b = 10 >>> a, b = b, a >>> a 10 >>> b 5 In the highlighted line, you swap the values of a and b without using a temporary variable, as you saw before....
#complex number print 2+3j print 2+3j*3 使用Decimal控制精确的小数点位数#decimal from decimal import Decimal print Decimal('1.0') + Decimal('1.2') 和数字相关的模块有:math数学模块、random随机模块、等于和是的概念 “等于”和“是” (== and is) #== tests if the two variables refer equal o...
from functools import wraps def dec(msg='default'): def decorator(klass): old_foo = klass.foo @wraps(klass.foo) def decorated_foo(self, *args, **kwargs): print('@decorator pre %s' % msg) old_foo(self, *args, **kwargs) print('@decorator post %s' % msg) klass.foo = decorated...
Discover how to use Python variables in our easy guide. Learn to create, assign, and manipulate variables with simple examples and practical tips.
Local computer:Only if you modified the source code on the remote computer as outlined above, then in the source code, add a commented-out copy of the same code added on the remote computer. Adding these lines makes sure that the source code on both computers matches line by line. ...
formatter = ("%r %r %r %r")print((formatter) % (1, 2, 3, 4))print((formatter) % ("one","two","three","four"))print((formatter) %(True, False, False, True))print((formatter) %(formatter, formatter, formatter, formatter))print((formatter) %("I had this thing.","That you ...
PEP 8: multiple statements on one line (colon) 解决方法:多行语句写到一行了,比如:if x == 2: print('OK')要分成两行写 PEP 8: line too long (82 > 79 characters) 解决方法:超过了每行的最大长度限制79 PEP 8: Simplify chained comparison ...
to inspect has fired, because if another oneoccurs, it clobbers the previous one.If you want IPython to automatically do this on every exception, seethe %pdb magic for more details... versionchanged:: 7.3When running code, user variables are no longer expanded,the magic line is always left...
For more information on using the Locals window, see Inspect variables in the Autos and Locals windows. To use the Watch windows, select Debug > Windows > Watch > Watch 1-4. This option allows you to enter arbitrary Python expressions and view the results. Expressions are reevaluated for ea...
print("OR, we can use variables from our script:")13amount_of_cheese=1014amount_of_crackers=501516cheese_and_crackers(amount_of_cheese,amount_of_crackers)171819print("We can even do math inside too:")20cheese_and_crackers(10+20,5+6)212223print("And we can combine the two, variables ...