python 基础 - 2.python 一些进阶操作

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读取文件 

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file = open ("./pvuv.txt", 'r', encoding='utf-8')
for line in file.readlines ():
    print (line)
file.close ()

file = open ("./pvuv.txt", encoding='utf-8')
for line in file:
    print (line)
file.close ()
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with open ("./pvuv.txt", encoding='utf-8') as fin:
    print (type (fin))
# 输出：<class '_io.TextIOWrapper'>

with open ("./pvuv.txt", encoding='utf-8') as fin:
    print (fin)
# 输出：<_io.TextIOWrapper name='./pvuv.txt' mode='r' encoding='utf-8'>

with open ("./pvuv.txt") as fin:
    print (fin)
# 输出：<_io.TextIOWrapper name='./pvuv.txt' mode='r' encoding='cp936'>

with open ("./pvuv.txt", encoding='utf-8') as fin:
    for line in fin:
        print (type (line))
# 输出：多行的 <class'str'>
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datas = []
with open ("./pvuv.txt") as fin:
    is_first_line = True
    for line in fin:
        if is_first_line:
            is_first_line = False
            continue
        datas.append (line [:-1].split ("\t"))
# 这里用 line [:-1] 是因为读取各行的时候会连换行符 '\n' 一起读取 

# 也可以这样处理 
datas = []
with open ("./pvuv.txt", encoding='utf-8') as fin:
    for line in fin:
        print (line [:].replace ('\n', ''))
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txt = "Google#Runoob#Taobao#Facebook"
# 第二个参数为 1，返回两个参数列表 
x = txt.split ("#", 1)
print x
# 输出：['Google', 'Runoob#Taobao#Facebook']