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with open('test.txt') as f
    for line in f:
        print(line)

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_functions = {}
def register(f):
    global _functions
    _functions[f.__name__] = f
    return f
    
@register
def foo():
    return 'bar'

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#方法1：使用os.listdir
import os
for filename in os.listdir(r'c:\windows'):
    print filename

#方法2：使用glob模块，可以设置文件过滤
import glob
for filename in glob.glob(r'c:\windows\*.exe'):
    print filename

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// 条件在 case 中
func unhex(c byte) byte {
    switch {
    case '0' <= c && c <= '9':
        return c - '0'
    case 'a' <= c && c <= 'f':
        return c - 'a' + 10
    case 'A' <= c && c <= 'F':
        return c - 'A' + 10
    }

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// 只有函数声明,没有函数体,表明函数以其他语言实现
func Sin(x float64) float //implemented in assembly language

// 可变参数
func sum(values...int) int {

}

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errors.go 源码

package errors

// New returns an error that formats as the given text.
func New(text string) error {
	return &errorString{text}
}

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select {
case <-ch1:
  //...
case x:= <-ch2:
  //...
case ch3 <- y:
  //...
default:
  //...
}

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// 更安全的随机
package main

import (
	"crypto/rand"
	// "encoding/base64"
	// "encoding/hex"
	"fmt"
)

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for init; condition; post {}

// 如同 c 的 while
for condition {}

// 死循环
for {}

// 遍历数组,切片,字符串,map等
for key, value := range aList {}

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// 故意在接口中定义方法, 以防止其他类型无意中实现了该接口
type runtime.Error interface {
	error
    RuntimeError()
}

// or
type testing.TB interface {
	Error(args ...interface{})
	Errorf(format string, args ...interface{})