print("hello world")
print('hello world')
print("""hello world""")

# 輸出結(jié)果
hello world
hello world
hello world

# 單雙引號(hào)
print("hello 'poloyy' world")
print('this is my name "poloyy"')

# 輸出結(jié)果
hello 'poloyy' world
this is my name "poloyy"

# 多行字符串
print("""
hello
world
""")
print("""
this
is
my
name
poloyy
""")

# 輸出結(jié)果
hello
world

this
is
my
name
poloyy

# 轉(zhuǎn)義符
print("hello \"poloyy\" world")
print('my name is \'poloyy\'')

# 輸出結(jié)果
hello "poloyy" world
my name is 'poloyy'

print("反斜杠 \\ 是什么")
print("換行符是什么 \\n")

# 輸出結(jié)果
反斜杠 \ 是什么
換行符是什么 \n

print("c:\nothing\rtype")
print("c:\\nothing\\rtype")

# 輸出結(jié)果
c:\nothing\
c:
type
c:\nothing\rtype

print(r"c:\nothing\rtype")

# 輸出結(jié)果
c:\nothing\rtype

# 獲取字符串某個(gè)字符
str = "hello world"
print(str[0])
print(str[1])
print(str[6])
print(str[-1])
print(str[-5])

# 輸出結(jié)果
h
e
w
d
l

str[start : end : step]

print("hello world'[:] ", 'hello world'[:])  # 取全部字符
print("hello world'[0:] ", 'hello world'[0:])  # 取全部字符
print("hello world'[6:] ", 'hello world'[6:])  # 取第 7 個(gè)字符到最后一個(gè)字符
print("hello world'[-5:] ", 'hello world'[-5:])  # 取倒數(shù)第 5 個(gè)字符到最后一個(gè)字符

print("hello world'[0:5] ", 'hello world'[0:5])  # 取第 1 個(gè)字符到第 5 個(gè)字符
print("hello world'[0:-5] ", 'hello world'[0:-5])  # 取第 1 個(gè)字符直到倒數(shù)第 6 個(gè)字符
print("hello world'[6:10] ", 'hello world'[6:10])  # 取第 7 個(gè)字符到第 10 個(gè)字符
print("hello world'[6:-1] ", 'hello world'[6:-1])  # 取第 7 個(gè)字符到倒數(shù)第 2 個(gè)字符
print("hello world'[-5:-1] ", 'hello world'[-5:-1])  # 取倒數(shù)第 5 個(gè)字符到倒數(shù)第 2 個(gè)字符

print("hello world'[::-1] ", 'hello world'[::-1])  # 倒序取所有字符
print("hello world'[::2] ", 'hello world'[::2])  # 步長(zhǎng)=2，每?jī)蓚€(gè)字符取一次
print("hello world'[1:7:2] ", 'hello world'[1:7:2])  # 步長(zhǎng)=2，取第 2 個(gè)字符到第 7 個(gè)字符，每?jī)蓚€(gè)字符取一次

# 輸出結(jié)果
hello world'[:] hello world
hello world'[0:] hello world
hello world'[6:] world
hello world'[-5:] world


hello world'[0:5] hello
hello world'[0:-5] hello
hello world'[6:10] worl
hello world'[6:-1] worl
hello world'[-5:-1] worl


hello world'[::-1] dlrow olleh
hello world'[::2] hlowrd
hello world'[1:7:2] el