Python3基础语法 从入门到精通三解析

# Python3 break continue pass 语句区别 
for str in 'Python':     # break Example 
   if str == 'h': 
      break 
   print ('Current str :',str); 
 
print("break demo is end"); 
 
for str in 'Python':     # continue Example 
   if str == 'h': 
      continue 
   print ('Current str :',str); 
 
print("continue demo is end"); 
 
for str in 'Python':      # pass Example 
    if str == 'h': 
        pass 
    print("Current str :",str) 
print("pass demo is end"); 
 
#Python 字符函数 
s = "HelloWorld"; 
print("转换 s 中的小写字母为大写:",s.upper()); 
print("返回长度为 width 的字符串，原字符串 string 右对齐，前面填充:",s.zfill(12));