C++ on 300.Watts

Common Python and C++11 usage comparison

morristai01@gmail.com (Morris) — Sun, 12 May 2019 11:46:56 +0800

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Define Variables

Python
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a = 1 b = 0.0 c = 'xxx'

C++

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int a = 1;
auto a = 1;
double b = 0.0;
auto b = 0.0;
const char c[] = "xxx"; // C string (char array)
const char* c = "xxx"; // C string (pointer)
std::string c = "xxx";
std::string c("xxx");
std::string c{"xxx"};

Variable Scopes

Python

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global_var1 = 1
def func(arg):
 local_var = 2
 global global_var2
 global_var2 = 'xxx' # global
if arg:
 local_var2 = 0.5 # scope: function
 ...
 # if arg evaluates to True,
 # local_var2 is still accessible here.
 return False