s = "func"
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现在假设有一个称为func的函数。当函数名以字符串形式给出时,如何在Python 2.7中调用func?
from __future__ import print_function
try:
print "a"
except SyntaxError:
print('error')
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为什么SyntaxError异常没有被抓住?我使用的是Python 2.7
输出:
File "test", line 4
print "a"
^
SyntaxError: invalid syntax
Run Code Online (Sandbox Code Playgroud) 给定一个由十六进制数组成的字符串。
s = "F716F92C8Aba"
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确定n从右计数的第 th 位是否设置为 1的最简单方法是什么?所以n=0将是最正确的一点。
蟒蛇 2.7
c = [1,2,3,4,5,6,7,8,9,10]
for a,b in func(c):
doSomething()
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所以func()必须返回 (1,2) (2,3) (3,4) ... (8,9) (9,10)
在python 2.7中是否有一个优雅的方法来实现这一目标?
struct departure_compare {
bool operator() (const Leg* lhs, const Leg* rhs) const
{
return lhs->CurrentDepartureTime() < rhs->CurrentDepartureTime();
}
};
class Station
{
uint station_number_;
std::set<Leg *, departure_compare> departure_legs_in_order_; // legs that depart from this station in order of departure time
public:
Station(uint station_number) : station_number_(station_number) {};
void addDepartureLeg(Leg *leg) { departure_legs_in_order_.insert(leg); };
const std::set<Leg *, departure_compare>& DepartureLegs() const { return departure_legs_in_order_; };
uint StationNumber() { return station_number_; };
};
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我把它称为循环
Leg *new_leg = new Leg();
start_station->addDepartureLeg(new_leg); // start_station of type …Run Code Online (Sandbox Code Playgroud)