Extracting useful information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 411 33.3 Error handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412 33.4 Exception give you an error: julia> pi π = 3.1415926535897... julia> pi = 3 ERROR: cannot assign a value to imported variable Base.pi from module Main julia> sqrt(100) 10.0 julia> sqrt = 4 ERROR: cannot assign julia> x, ___ = size([2 2; 1 1]) (2, 2) julia> y = ___ ERROR: syntax: all-underscore identifier used as rvalue julia> println(___) ERROR: syntax: all-underscore identifier used as rvalue The only

Extracting useful information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 411 33.3 Error handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412 33.4 Exception give you an error: julia> pi π = 3.1415926535897... julia> pi = 3 ERROR: cannot assign a value to imported variable Base.pi from module Main julia> sqrt(100) 10.0 julia> sqrt = 4 ERROR: cannot assign julia> x, ___ = size([2 2; 1 1]) (2, 2) julia> y = ___ ERROR: syntax: all-underscore identifier used as rvalue julia> println(___) ERROR: syntax: all-underscore identifier used as rvalue The only

Extracting useful information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438 34.3 Error handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439 34.4 Exception give you an error: julia> pi π = 3.1415926535897... julia> pi = 3 ERROR: cannot assign a value to imported variable Base.pi from module Main julia> sqrt(100) 10.0 julia> sqrt = 4 ERROR: cannot assign 2; 1 1]) (2, 2) julia> y = ___ ERROR: syntax: all-underscore identifiers are write-only and their values cannot be used in expressions �→ julia> println(___) ERROR: syntax: all-underscore identifiers

Extracting useful information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438 34.3 Error handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439 34.4 Exception give you an error: julia> pi π = 3.1415926535897... julia> pi = 3 ERROR: cannot assign a value to imported variable Base.pi from module Main julia> sqrt(100) 10.0 julia> sqrt = 4 ERROR: cannot assign 2; 1 1]) (2, 2) julia> y = ___ ERROR: syntax: all-underscore identifiers are write-only and their values cannot be used in expressions �→ julia> println(___) ERROR: syntax: all-underscore identifiers

Extracting useful information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438 34.3 Error handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439 34.4 Exception give you an error: julia> pi π = 3.1415926535897... julia> pi = 3 ERROR: cannot assign a value to imported variable Base.pi from module Main julia> sqrt(100) 10.0 julia> sqrt = 4 ERROR: cannot assign 2; 1 1]) (2, 2) julia> y = ___ ERROR: syntax: all-underscore identifiers are write-only and their values cannot be used in expressions �→ julia> println(___) ERROR: syntax: all-underscore identifiers

Extracting useful information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 448 34.3 Error handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449 34.4 Exception you have explicitly imported, Julia will give you an error: julia> using Base: pi, sqrt julia> pi π = 3.1415926535897... julia> pi = 3 ERROR: cannot assign a value to imported variable Base.pi from from module Main julia> sqrt(100) 10.0 julia> sqrt = 4 ERROR: cannot assign a value to imported variable Base.sqrt from module MainCHAPTER 4. VARIABLES 12 Julia 1.12 Note that in versions prior to

Extracting useful information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449 34.3 Error handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 450 34.4 Exception you have explicitly imported, Julia will give you an error: julia> using Base: pi, sqrt julia> pi π = 3.1415926535897... julia> pi = 3 ERROR: cannot assign a value to imported variable Base.pi from from module Main julia> sqrt(100) 10.0 julia> sqrt = 4 ERROR: cannot assign a value to imported variable Base.sqrt from module MainCHAPTER 4. VARIABLES 12 Julia 1.12 Note that in versions prior to

Extracting useful information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 448 34.3 Error handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449 34.4 Exception you have explicitly imported, Julia will give you an error: julia> using Base: pi, sqrt julia> pi π = 3.1415926535897... julia> pi = 3 ERROR: cannot assign a value to imported variable Base.pi from from module Main julia> sqrt(100) 10.0 julia> sqrt = 4 ERROR: cannot assign a value to imported variable Base.sqrt from module MainCHAPTER 4. VARIABLES 12 Julia 1.12 Note that in versions prior to

Extracting useful information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 448 34.3 Error handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449 34.4 Exception you have explicitly imported, Julia will give you an error: julia> using Base: pi, sqrt julia> pi π = 3.1415926535897... julia> pi = 3 ERROR: cannot assign a value to imported variable Base.pi from from module Main julia> sqrt(100) 10.0 julia> sqrt = 4 ERROR: cannot assign a value to imported variable Base.sqrt from module MainCHAPTER 4. VARIABLES 12 Julia 1.12 Note that in versions prior to

Extracting useful information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 448 34.3 Error handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449 34.4 Exception you have explicitly imported, Julia will give you an error: julia> using Base: pi, sqrt julia> pi π = 3.1415926535897... julia> pi = 3 ERROR: cannot assign a value to imported variable Base.pi from from module Main julia> sqrt(100) 10.0 julia> sqrt = 4 ERROR: cannot assign a value to imported variable Base.sqrt from module MainCHAPTER 4. VARIABLES 12 Julia 1.12 Note that in versions prior to