Python programming, data formatted output (character splicing)

print(f'my name is {name.capitalize()}.')    # my name is Jack.

print(f'I am {age:*^10} years old.')    # I am ****18**** years old.

print(f'I am a {sex}')    # I am a man

print(f'My salary is {salary:10.3f}')    # My salary is   9999.990
  
# 不带参数
print('{} {}'.format('hello','world'))    # 结果：hello world

# 带数字参数
print('{0} {1}'.format('hello','world'))    # 结果：hello world

# 参数顺序倒乱
print('{0} {1} {0}'.format('hello','world'))    # 结果：hello world hello

# 带关键字参数
print('{a} {tom} {a}'.format(tom='hello',a='world'))    # 结果：world hello world