filename = 'test.txt'
# 以只讀方式打開test.txt文件
fd = open(filename, 'r', encoding='utf-8')
# fd.read(self, n) 按指定的長度讀取文件內(nèi)容,為空則讀取全部內(nèi)容
lines = fd.read()
print(lines)
fd.close()
print('------------------read------------------------')

# 以寫入模式打開test.txt文件
fd = open(filename, 'w', encoding='utf-8')
# fd.write(self, str) 將str寫入文件
lines_w = fd.write('java\nPython\tGolang')
print(lines_w)
fd.close()
print('------------------write------------------------')

# 以追加模式打開文件
fd = open(filename, 'a', encoding='utf-8')
lines_a = fd.write('java\nPython\tGolang')
print(lines_a)
fd.close()
print('------------------append------------------------')

# 以讀寫模式打開文件(r+)
fd = open(filename, 'r+', encoding='utf-8')
print(fd.read())
lines_str = fd.write('java\nPython\tGolang')
print(fd.read())
fd.close()
print('------------------readWrite------------------------')

# 以讀寫模式打開文件(w+)
fd = open(filename, 'w+', encoding='utf-8')
lines_str = fd.write('java\nPython\tGolang')
print(fd.read())        # 文件打開時清空文件內(nèi)容，雖然寫入了文件，但未保存，因此讀取文件為空
fd.close()
print('------------------readWrite------------------------')

# 以讀寫模式打開文件(a+)
fd = open(filename, 'a+', encoding='utf-8')
print(fd.read())
# 按行讀取
print(fd.readlines(2))
lines_str = fd.write('java\nPython\tGolang')
print(fd.read())
fd.close()
print('------------------readWrite------------------------')